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/battle_main.c

@@ -4374,10 +4374,10 @@ static void HandleTurnActionSelectionState(void)
             }
             break;
         case STATE_WAIT_ACTION_CONFIRMED_STANDBY:
-            if (!(gBattleControllerExecFlags & ((gBitTable[gActiveBattler]) 
+            if (!(gBattleControllerExecFlags & ((gBitTable[gActiveBattler])
                                                 | (0xF << 28)
-                                                | (gBitTable[gActiveBattler] << 4) 
-                                                | (gBitTable[gActiveBattler] << 8) 
+                                                | (gBitTable[gActiveBattler] << 4)
+                                                | (gBitTable[gActiveBattler] << 8)
                                                 | (gBitTable[gActiveBattler] << 12))))
             {
                 if (AllAtActionConfirmed())