Ignore test at method level

In a previous commit, we @Ignore'd a test class. It turns out, this
doesn't work, and in fact causes a test module error in presubmit
(though evidently not when the previous commit was submitted).

Test: atest LocationProviderInterceptDialogTest
Bug: 288471744
Fix: 297039918
Change-Id: If21937a17d3a3f2851ea0d5e135473de0e551cac