Ensure background data restriction is off before test

Test checks for metered connection in background, it fails with data
saver because it restricts background data usage.
Bug: 71056176
Test: cts-tradefed run cts -m CtsJobSchedulerTestCases
-tandroid.jobscheduler.cts.ConnectivityConstraintTest#testConnectivityConstraintExecutes_metered

Change-Id: I8a449c2fc51344d67685852bdf6caf8ca9dfd359
1 file changed