Fix a debuggerd test expectation.

70d8f289454c9b691ec5421b0ed0354b6baaace8 broke a test that was not
expecting to see the new detail about the signal's sender.

Bug: http://b/78594105
Test: ran tests
Change-Id: Idfa3a53b9e664308efdba560ffbb1401c1904530
1 file changed