fix(common): do not override locale provided on bootstrap

[DzmitryShylovich]

Closes #13607

[vicb]

Please add a test

[DzmitryShylovich]

@vicb There's a problem with writing a test case for it :)
I need to create a new platform with providers, but there's already a default platform configured for test thus I cannot create a new one (only 1 platform can be active at a time). I also cannot destry a default one because, for some reason, it's already marked as destroyed. I faced the same issue here #13105
I tried to use compiler providers:

defaultPlatform.bootstrapModule(createModule(), {providers: [{provide: LOCALE_ID, useValue: 'fr-FR'}]})

but they are not available for the app.
So do u know where I can found a test example with a custom platform or do u have an idea how I can test it without creating a new platform?

[vicb]

Create an e2e test?

[DzmitryShylovich]

@vicb added a test

[vicb]

great, thanks !

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