Rename song constants using Japanese sound test menu

data/maps/PokemonLeague_LoreleisRoom/map.json

@@ -2,7 +2,7 @@
   "id": "MAP_POKEMON_LEAGUE_LORELEIS_ROOM",
   "name": "PokemonLeague_LoreleisRoom",
   "layout": "LAYOUT_POKEMON_LEAGUE_LORELEIS_ROOM",
-  "music": "BGM_FRLG_GYM",
+  "music": "MUS_GYM",
   "region_map_section": "MAPSEC_POKEMON_LEAGUE",
   "requires_flash": false,
   "weather": "WEATHER_NONE",

data/maps/PokemonLeague_LoreleisRoom/text.inc

@@ -7,7 +7,7 @@ gUnknown_8177FA4:: @ 8177FA4
     .string "Your POKéMON will be at my mercy\n"
     .string "when they are frozen solid.\p"
     .string "Hahaha!\n"
-    .string "Are you ready?{PLAY_BGM}{BGM_FRLG_LEADER_EYE}$"
+    .string "Are you ready?{PLAY_BGM}{MUS_EXEYE}$"
 
 gUnknown_8178089:: @ 8178089
     .string "Welcome to the POKéMON LEAGUE.\p"
@@ -20,7 +20,7 @@ gUnknown_8178089:: @ 8178089
     .string "Your POKéMON will be at my mercy\n"
     .string "when they are frozen solid.\p"
     .string "Hahaha!\n"
-    .string "Are you ready?{PLAY_BGM}{BGM_FRLG_LEADER_EYE}$"
+    .string "Are you ready?{PLAY_BGM}{MUS_EXEYE}$"
 
 Text_178191:: @ 8178191
     .string "…Things shouldn't be this way!$"