frlg eventflag recognition fix

referenced wrong string resource
note that frlg has no data so no flags/consts will appear (only custom
mods allowed).
closes #1497

PKHeX.WinForms/Subforms/Save Editors/SAV_EventFlags.cs

@@ -140,7 +140,7 @@ private string[] GetStringList(string type)
                 case GameVersion.FR:
                 case GameVersion.LG:
                 case GameVersion.FRLG:
-                    gamePrefix = "e";
+                    gamePrefix = "frlg";
                     break;
                 default:
                     return null;