Fix EditorPlugin::remove_control_from_docks freeing passed control

[kleonc]

Fixes #117331.

Fixes a regression from #106503 which made remove_control_from_docks(docked_control) result in freeing the passed docked_control.

After #106503 when a Control is added to a dock with add_control_from_dock it is wrapped into an EditorDock node by adding it as its child. On remove_control_from_docks such EditorDock is freed, but the wrapped control was never being removed from it, hence it was freed together with its parent. This is a regresion / compatibilty breakage, as remove_control_from_docks is documented to not free the passed control and tells clearly it's the user responsibility.

godot/doc/classes/EditorPlugin.xml

Lines 681 to 686 in 9095a76

	<method name="remove_control_from_docks" deprecated="Use [method remove_dock] instead.">
	<return type="void" />
	<param index="0" name="control" type="Control" />
	<description>
	Removes the control from the dock. You have to manually [method Node.queue_free] the control.
	</description>

[Repiteo]

Thanks!