Update test to use match external interface change

This commit fixes a test that would be broken due to a change to the
RcsGroupThread constructor.

Bug: 123699565
Test: Existing tests pass
Change-Id: Ifddf1b5d2f98795fefa4c975ed85d13ad373dcb6
Merged-In: Ifddf1b5d2f98795fefa4c975ed85d13ad373dcb6
(cherry picked from commit e6cd8e2103bb20db9b6a78ca47d7f6ddd451b9d3)
1 file changed