Revert "Fixed: iOS ActivityIndicator disrespects its visibility property when starting / stopping"
Revert "Fixed: iOS ActivityIndicator disrespects its visibility property when starting / stopping"

This reverts commit e2692253362a5dae69aae8b32f7810a042710c34.

NativeScript/NativeScript,NativeScript/NativeScript,NativeScript/NativeScript,NativeScript/NativeScript,NativeScript/NativeScript