Rename the Artist/Image App files to match the app's class name

module/apps/ArtBrowser.mjs

@@ -1,7 +1,7 @@
 import { __ID__, filePath } from "../consts.mjs";
 import { getFile, lastModifiedAt } from "../utils/fs.mjs";
 import { paginate } from "../utils/pagination.mjs";
-import { ImageApp } from "./Image.mjs";
+import { ImageApp } from "./ImageApp.mjs";
 
 const { HandlebarsApplicationMixin, ApplicationV2 } = foundry.applications.api;
 const { FormDataExtended } = foundry.applications.ux;