control filename trimmed to the wrong size in line 417

trimmed controller filename to the size of settings filename, resulting in controller file having "config=" attached to it.

(
16:19:570 Config.cpp:891 E[LOAD]: Error saving config - can't read ini C:\Games\ppsspp\memstick/PSP/SYSTEM/config=c:\temp\tcon.ini
16:19:570 Config.cpp:895 E[LOAD]: Error saving config - can't write ini C:\Games\ppsspp\memstick/PSP/SYSTEM/config=c:\temp\tcon.ini)