Fixed a typo in Droid label renderer

[dimonovdd]

Description of Change

For some reason, there was an unnecessary cast to FormsTextView. It does not allow we to override CreateNativeControl.

API Changes

Fixed:

protected override TextView CreateNativeControl()
  => new AppCompatTextView(Context);

Platforms Affected

• Android

PR Checklist

• Targets the correct branch
• Tests are passing (or failures are unrelated)

[rmarinho]

/azp run

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