Removed trailing spaces in the most relevant files

Command used for the job:
egrep -rl ' $' --include *.c --include *.h --include  *.s --include  *.inc --include  *.txt *  | xargs sed -i 's/\s\+$//g'

Credits to Grant Murphy from Stack Overflow.

src/record_mixing.c

@@ -952,7 +952,7 @@ static void Task_DoRecordMixing(u8 taskId)
         else
             task->data[0] = 6;
         break;
-    
+
     // Mixing Ruby/Sapphire records.
     case 2:
         SetContinueGameWarpStatusToDynamicWarp();