Telecomm: Fix ConnectionServiceRepository

Fix the cache removal.

Found by Errorprone.

(cherry picked from commit 1839ce18)

Bug: 73288226
Test: m javac-check RUN_ERROR_PRONE=true
Test: atest TelecomUnitTests
Merged-In: I835f3ef9f85cde84bb9ec6882540fc9b71c5b85e
Change-Id: I835f3ef9f85cde84bb9ec6882540fc9b71c5b85e