Generate region_map_sections from JSON (#677)

src/pokemon_summary_screen.c

@@ -5212,7 +5212,7 @@ static bool32 CurrentMonIsFromGBA(void)
 
 static bool32 MapSecIsInKantoOrSevii(u8 mapSec)
 {
-    if (mapSec >= MAPSECS_KANTO && mapSec < MAPSEC_NONE)
+    if (mapSec >= KANTO_MAPSEC_START && mapSec < MAPSEC_NONE)
         return TRUE;
     return FALSE;
 }