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/contest_ai.c

@@ -1732,7 +1732,7 @@ static void ContestAICmd_if_user_doesnt_have_exciting_move(void)
 
 // BUG: This is checking if the user has a specific move, but when it's used in the AI script
 //      they're checking for an effect. Checking for a specific effect would make more sense,
-//      but given that effects are normally read as a single byte and this reads 2 bytes, it 
+//      but given that effects are normally read as a single byte and this reads 2 bytes, it
 //      seems reading a move was intended and the AI script is using it incorrectly.
 //      The fix below aligns the function with how it's used by the script, rather than the apparent
 //      intention of its usage
@@ -1750,7 +1750,7 @@ static void ContestAICmd_check_user_has_move(void)
         #else
         u16 move = gContestMons[eContestAI.contestantId].moves[i];
         #endif
-        
+
         if (move == targetMove)
         {
             hasMove = TRUE;