Rename UiHandler file to fit conventions

src/ui/command-ui-handler.ts

@@ -3,7 +3,7 @@ import BattleScene, { Button } from "../battle-scene";
 import { addTextObject, TextStyle } from "./text";
 import PartyUiHandler, { PartyUiMode } from "./party-ui-handler";
 import { Mode } from "./ui";
-import UiHandler from "./uiHandler";
+import UiHandler from "./ui-handler";
 
 export enum Command {
   FIGHT = 0,