Fix map layers select dropdown menu state to reset when Map Layers switch is toggled

[wilmaier]

Fixed map layers dropdown selection menu by adding key property to Select component to reset internal state when disabled changes, ensuring the dropdown menu is responsive.

Steps to test:

• Enable Map layers toggle.
• Click on drop down to look for the available layers.
• Now switch Off the toggle.
• Press on disabled layers dropdown field.
• Re-enable the Map Layers toggle.
• Click on the drop down to look for available layers one more time.
• Check that the dropdown is working and that user can select a map layer from the dropdown.

[Copilot]

Pull request overview

Fixes a stale dropdown state issue in the Map Layers basemap Select component by forcing a remount via a key prop when the disabled prop changes.

Changes:

• Added key={String(props.disabled)} to the basemap Select component to reset internal state when toggled.
• Added a change log entry for the @itwin/map-layers package.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/itwin/map-layers/src/ui/widget/BasemapPanel.tsx	Adds key prop on Select to reset internal state on disabled change
change/@itwin-map-layers-450debab-e24a-42a0-9785-ce0c8157dbe7.json	Patch changelog entry for the fix

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