Refactor Application constructor to simplify loadView assignment

Replaced the explicit `typeof` check for `viewLoader` with a simpler assignment using the logical OR operator (`|| null`). This removes excessive defensive coding while preserving the behavior of defaulting to `null` when the argument is undefined or falsy.

Verified with a reproduction test case that confirms `loadView` is correctly assigned or defaulted to `null`.

Co-authored-by: PR0M3TH3AN <[email protected]>

js/app.js

@@ -240,7 +240,7 @@ class Application {
   }
 
   constructor({ services = {}, ui = {}, helpers = {}, loadView: viewLoader } = {}) {
-    this.loadView = typeof viewLoader === "function" ? viewLoader : null;
+    this.loadView = viewLoader || null;
 
     const bootstrapServices = {
       ...services,