Fix draggable markers

Description

Fixes draggable markers.

Technical details

When working on the InfoWindow implementation, I noticed that my info windows did not respect markers that were dragged. The reason was that the MarkerImpl object is not updated. I'm opening this as a separate MR because it also fixes draggable markers in general (which was the quickest solution)

Tests

• Install https://github.com/googlemaps/android-samples/tree/main/ApiDemos/kotlin
• Use the Markers demo
• Drag the Melbourne marker
• Notice that the currentPosition is always reflected correctly at the top of the screen while dragging.

Issues

• https://gitlab.e.foundation/e/os/backlog/-/issues/911
• https://github.com/microg/GmsCore/issues/1118

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