Sync some specials/drop unnecessary prefixes

include/field_specials.h

@@ -14,7 +14,7 @@ enum HiddenItemAttr
 u8 GetLeadMonIndex(void);
 s32 CountDigits(s32 number);
 void TV_PrintIntToStringVar(u8, int);
-u16 ScrSpecial_GetStarter(void);
+u16 GetStarterSpecies(void);
 void StopPokemonLeagueLightingEffectTask(void);
 void nullsub_60(void);
 void nullsub_61(void);