Summary: Diff D38749 added logical client version matching to select backends functionality . This diff mistakenly added one extra `if (yb_is_auth_backend)` code block which is not needed. This diff removes it.

Test Plan: Jenkins: enable connection manager, all tests

Reviewers: vpatibandla

Reviewed By: vpatibandla

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D40428