Don't clear keys on layer change unless STRICT_LAYER_RELEASE is enabled (#18577)

* Don't clear mousekeys unless clearing keys

* Revert "Don't clear mousekeys unless clearing keys"

This reverts commit 29a0c06b547d72b80d416a8b6fab478c77fbd247.

* Just don't clear anything on layer set

* Fix lint

* Enable test?

tests/basic/test_action_layer.cpp

@@ -360,7 +360,6 @@ TEST_F(ActionLayer, LayerTapToggleWithToggleWithKeypress) {
 }
 
 TEST_F(ActionLayer, LayerTapReleasedBeforeKeypressReleaseWithModifiers) {
-    GTEST_SKIP() << "TODO: Modifiers are erroneously discarded on layer changes, although a key that introduced the modifier is still held.";
     TestDriver driver;
     InSequence s;