Rename song constants using Japanese sound test menu

data/maps/PokemonLeague_AgathasRoom/map.json

@@ -2,7 +2,7 @@
   "id": "MAP_POKEMON_LEAGUE_AGATHAS_ROOM",
   "name": "PokemonLeague_AgathasRoom",
   "layout": "LAYOUT_POKEMON_LEAGUE_AGATHAS_ROOM",
-  "music": "BGM_FRLG_POKEMON_TOWER",
+  "music": "MUS_P_TOWER",
   "region_map_section": "MAPSEC_POKEMON_LEAGUE",
   "requires_flash": false,
   "weather": "WEATHER_NONE",

data/maps/PokemonLeague_AgathasRoom/text.inc

@@ -11,7 +11,7 @@ gUnknown_817844D:: @ 817844D
     .string "He's wrong.\n"
     .string "POKéMON are for battling!\p"
     .string "{PLAYER}! I'll show you how a real\n"
-    .string "TRAINER battles!{PLAY_BGM}{BGM_FRLG_LEADER_EYE}$"
+    .string "TRAINER battles!{PLAY_BGM}{MUS_EXEYE}$"
 
 gUnknown_817858D:: @ 817858D
     .string "I am AGATHA of the ELITE FOUR.\p"
@@ -26,7 +26,7 @@ gUnknown_817858D:: @ 817858D
     .string "He's wrong.\n"
     .string "POKéMON are for battling!\p"
     .string "{PLAYER}! I'll show you how a real\n"
-    .string "TRAINER battles!{PLAY_BGM}{BGM_FRLG_LEADER_EYE}$"
+    .string "TRAINER battles!{PLAY_BGM}{MUS_EXEYE}$"
 
 Text_1786D7:: @ 81786D7
     .string "Oh, my!\n"