Remove test item for status bar icon test

This was migrated to cts interactive and partially cleaned up.
Looks like removing the actual variable was missed, which results
in an empty item in the list of test cases. Related change in which
it was migrated: 19710647

Test: manual - CtsVerifier mananged provisioning test list
Bug: 297188155
Change-Id: Ie5cbefece5cf0ccf0d3fe37f171a8a435b9ed5ba