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/palette.c

@@ -586,7 +586,7 @@ static u8 UpdateFastPaletteFade(void)
 
     if (IsSoftwarePaletteFadeFinishing())
         return gPaletteFade.active ? PALETTE_FADE_STATUS_ACTIVE : PALETTE_FADE_STATUS_DONE;
-        
+
 
     if (gPaletteFade.objPaletteToggle)
     {
@@ -721,7 +721,7 @@ static u8 UpdateFastPaletteFade(void)
         gPaletteFade.mode = NORMAL_FADE;
         gPaletteFade.softwareFadeFinishing = 1;
     }
-    
+
     // gPaletteFade.active cannot change since the last time it was checked. So this
     // is equivalent to `return PALETTE_FADE_STATUS_ACTIVE;`
     return gPaletteFade.active ? PALETTE_FADE_STATUS_ACTIVE : PALETTE_FADE_STATUS_DONE;
@@ -986,8 +986,8 @@ static bool32 IsBlendPalettesGraduallyTaskActive(u8 id)
     int i;
 
     for (i = 0; i < NUM_TASKS; i++)
-        if ((gTasks[i].isActive == TRUE) 
-            && (gTasks[i].func == Task_BlendPalettesGradually) 
+        if ((gTasks[i].isActive == TRUE)
+            && (gTasks[i].func == Task_BlendPalettesGradually)
             && (gTasks[i].tId == id))
             return TRUE;