[iOS GoogleMap] Fix animateCamera (#2608)
[iOS GoogleMap] Fix animateCamera (#2608)

Fixed a bug that
zoom and heading will always be 0 if they are not included in the argument of animateCamera
wannyk/react-native-maps,lelandrichardson/react-native-maps,lelandrichardson/react-native-maps,wannyk/react-native-maps,lelandrichardson/react-native-maps,wannyk/react-native-maps,wannyk/react-native-maps