Revert "Add UI reskin by LJ Birdman (WiP)"

This reverts commit 0200a2688a.

src/enums/battle-spec.ts

@@ -1,3 +1,4 @@
+
 export enum BattleSpec {
     DEFAULT,
     FINAL_BOSS

src/enums/ui-theme.ts

@@ -1,4 +0,0 @@
-export enum UiTheme {
-  DEFAULT,
-  LEGACY
-}