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/data/contest_text_tables.h

@@ -181,7 +181,7 @@ extern const u8 gText_CouldntImproveItsCondition[];
 extern const u8 gText_BadConditionResultedInWeakAppeal[];
 extern const u8 gText_MonWasUnaffected[];
 extern const u8 gText_AttractedCrowdsAttention[];
- 
+
 // sContestConditions
 extern const u8 gText_Contest_Coolness[];
 extern const u8 gText_Contest_Beauty[];