Remove disabled a11yservices from the binding services list.

This could cause race conditions if a service connection is exited after
starting binding but before finishing binding.
If the service is mid-initialization when it gets disabled then there is
already logic to prevent full initialization and to exit the connection.

Bug: 252884894
Test: atest AccessibilityPrivacySourceTest --iterations 30
Change-Id: Ib5aa761bb4c9189df53d04d7dc5329aece650141