Remove strict mode directive from index.ts (#1069)

Adding the strict mode directive directly to the TS file causes a handful of odd issues:
* Strips the closing region tag. Where'd it go?
* Adds weird intermediate(?) output to the JS, rendering it un-runnable.

The directive isn't needed here, since `"strict": true` has already been specified in the tsconfig.json.

For future reference, always specify this directive as a compilerOption in tsconfig.json.

Author: willum070

samples/ui-kit-place-details-compact/index.ts

@@ -1,4 +1,3 @@
-'use strict';
 /*
  * @license
  * Copyright 2025 Google LLC. All Rights Reserved.