setNSAllowsArbitraryLoads to false by default in template (#28885)

Summary:
Since we already have `localhost` as`Exception Domains` in NSAppTransportSecurity to allow connect to dev server, the template should set `NSAllowsArbitraryLoads` to false by default, as exaplained in [Apple's document](https://developer.apple.com/documentation/bundleresources/information_property_list/nsapptransportsecurity/nsallowsarbitraryloads) as a good practice.

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[iOS] [enhancement] - set `NSAllowsArbitraryLoads` to `false` by default in template
Pull Request resolved: #28885

Differential Revision: D21624042

Pulled By: shergin

fbshipit-source-id: 690afcd037c3f328d293ef4475380a28efd9fee6

Author: wddwycc

template/ios/HelloWorld/Info.plist

@@ -26,8 +26,6 @@
 	<true/>
 	<key>NSAppTransportSecurity</key>
 	<dict>
-		<key>NSAllowsArbitraryLoads</key>
-		<true/>
 		<key>NSExceptionDomains</key>
 		<dict>
 			<key>localhost</key>