Revert "Prevent Remote Connection Services from unbinding when conference merges."

This reverts commit ab8d14b2.

Reason for revert: This temporary fix will be fixed in a more thorough way as part of the fix for b/286154316 in which we plan to ensure the associatedCallCount is always tracked accurately for both the remote connection service and primary connection service. 

Change-Id: I83545dcc3ac16c84a4f1ce1bcf1210ba7fbd0d3e