CTS fixes for Wear, which don't support backup feature

assumeTrue() is not available in JUnit3, so replacing it
with normal "if" check.

Test: make cts -j32 %% cts-tradefed run cts -m CtsBackupHostTestCases

BUG:64344089

Change-Id: Ie0ce48f203a03eb16224b819662216073c9fef72
2 files changed