Fix #437 toggling myLocationEnabled in example

[kuhnroyal]

myLocationEnabled can only be disabled for MyLocationRenderMode.normal - it is required for gps/compass. This change disables the appropriate buttons and actually passes the current render mode to the map widget.
Fixes #437

[josxha]

Making the buttons non-clickable is a valid workaround. However, I would prefer if we could make the parameter myLocationEnabled less dependent on another parameter. Making MyLocationRenderMode nullable or add a MyLocationRenderMode.none field could be possible solutions.

The assertion has been added in #244 so that the location permission doesn't get requested if not required (#243 (comment)).

flutter-maplibre-gl/maplibre_gl/lib/src/maplibre_map.dart

Lines 62 to 67 in 53a414e

	}) : assert(
	myLocationRenderMode != MyLocationRenderMode.normal
	? myLocationEnabled
	: true,
	"$myLocationRenderMode requires [myLocationEnabled] set to true.",
	),

[kuhnroyal]

Sounds good, this PR just fixes the example not working.

[josxha]

Alright 👍