top: CPU % indication bug fixed

In current version first digit after dot is always 0!

Before:

         PID COMMAND                   CPU(ms) CPU(%)  USED/STACK PRIO(BASE) STATE 
           0 Idle Task                  120020 50.060     0/    0   0 (  0)  READY 
           1 hpwork                       6322  2.082   740/ 3992 192 (192)  w:sig 
           2 lpwork                       1601  0.020   628/ 3992  50 ( 50)  READY 
           3 init                         1472  0.000  1388/ 4088 100 (100)  w:sem 
          43 nshterm                         0  0.000   508/ 2992 100 (100)  w:sem 
          54 mavlink_uart_rcv_0            107  0.080  1676/ 2992 215 (215)  w:sem 
          45 commander                     635  0.040  1772/ 2992 215 (215)  w:sig 
          46 commander_low_prio             65  0.000   516/ 2984  50 ( 50)  w:sem 
          48 px4io                       11213  5.044   820/ 2040 240 (240)  w:sem 
          53 mavlink_if0                  1808  0.000  1004/ 2040 100 (100)  w:sig 
         100 attitude_estimator_ekf      47184 21.057 12812/13992 250 (250)  w:sem 
          56 dataman                         1  0.000   748/ 2040 250 (250)  w:sem 
          58 navigator                    3178  1.021   892/ 2040 250 (250)  w:sem 
          74 sensors_task                 7514  3.042  1004/ 2040 250 (250)  w:sem 
         111 top                           217  3.082  1276/ 2992 100 (100)  RUN   
          82 sdlog2                        376  0.080  1836/ 2992  70 ( 70)  w:sem 
          84 gps                           761  0.020  1004/ 2040 220 (220)  w:sem 
         102 position_estimator_inav      6111  2.002  1980/ 4088 250 (250)  w:sem 
         104 mc_att_control               9385  4.023   944/ 2040 250 (250)  w:sem 
         108 mc_pos_control               1870  0.000   844/ 2040 250 (250)  w:sem 

After:

         PID COMMAND                   CPU(ms) CPU(%)  USED/STACK PRIO(BASE) STATE 
           0 Idle Task                    7568 50.718     0/    0   0 (  0)  READY 
           1 hpwork                        447  2.875   732/ 3992 192 (192)  w:sig 
           2 lpwork                        110  0.638   628/ 3992  50 ( 50)  READY 
           3 init                         1479  0.000  1388/ 4088 100 (100)  w:sem 
          43 nshterm                         0  0.000   492/ 2992 100 (100)  w:sem 
          54 mavlink_uart_rcv_0              8  0.000  1764/ 2992 215 (215)  w:sem 
          45 commander                      99  0.239  1780/ 2992 215 (215)  w:sig 
          46 commander_low_prio              4  0.000   540/ 2984  50 ( 50)  w:sem 
          48 px4io                         795  5.271   788/ 2040 240 (240)  w:sem 
          53 mavlink_if0                   130  0.798  1004/ 2040 100 (100)  w:sig 
         113 top                           476  3.514  1276/ 2992 100 (100)  RUN   
          56 dataman                         2  0.000   748/ 2040 250 (250)  w:sem 
          58 navigator                     193  1.437   932/ 2040 250 (250)  w:sem 
          74 sensors_task                  546  3.514  1092/ 2040 250 (250)  w:sem 
          82 sdlog2                         94  0.079  1836/ 2992  70 ( 70)  w:sem 
          84 gps                            54  0.319   940/ 2040 220 (220)  w:sig 
         100 attitude_estimator_ekf       3252 21.805 12812/13992 250 (250)  w:sem 
         102 position_estimator_inav       390  2.795  2028/ 4088 250 (250)  w:sem 
         104 mc_att_control                669  4.472   944/ 2040 250 (250)  w:sem 
         111 mc_pos_control                104  0.798   956/ 2040 250 (250)  w:sem