[google_maps_flutter] Fix typo in google_maps_flutter/example/map_ui.dart

[Vitaly-V]

Description

Fixed typo in google_maps_flutter/example/map_ui.dart

Related Issues

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[ditman]

Thanks for the fix @Vitaly-V! This (and others) had been bothering me for a while, but never found the time to tackle them! Merged!

[ditman]

This has been published now!