Add raw id fields for game contributor in server/game_dev/admin.py

All board members directly input the game and member id in game contributor admin

Co-authored-by: James Lee <82937700+SafetyInObscurity@users.noreply.github.com>

Author: bilibilistack

server/game_dev/admin.py

@@ -12,7 +12,7 @@ class EventAdmin(admin.ModelAdmin):
 
 
 class GameContributorAdmin(admin.ModelAdmin):
-    pass
+    raw_id_fields = ["game", "member"]
 
 
 class GameShowcaseAdmin(admin.ModelAdmin):