Previously, `RouterLinkActive` would only add or remove the active classes when
its active state changed. This means that if you accidentally add one of
the active classes to the static class attribute, it won't get removed
until the link becomes active and then deactives (because the class is
added at creation time and never removed until the `RouterLinkActive`
state changes from active to inactive).
fixes#54978
PR Close#54982
Andrew Scott