Cancel pending call redirection request if there's new one.

Currently we compare call ID from user interaction and saved pending
redirection request call ID to make sure we send the correct request.
But if there's a previous stuck pending request, all requests after that
will be blocked. When the call ID can't match, just cancel the previous
one.

Bug: 182215787
Test: Manually test, TelecomUnitTest
Change-Id: Ib223845138145ecab92e5fec0d2160aba577936b