Improve client input responsiveness

Move sampling input to the other side of framerate limiter.

Thanks to Alexander "wareya" Nadeau and Juraj "youurayy" Vitko for
pointing this out.

code/sys/sys_main.c

@@ -756,7 +756,6 @@ int main( int argc, char **argv )
 
 	while( 1 )
 	{
-		IN_Frame( );
 		Com_Frame( );
 	}