Fix start-of-funtion line number being slightly inaccurate

In the old code the function's starting line was inserted
immediately after the "proc" opcode:

1.pwn:1
#include <a_samp>
00000008  proc
1.pwn:3
main() {
0000000c  break

Now it's like this:

1.pwn:3
#include <a_samp>
main() {
00000008  proc
0000000c  break