Fix testDisallowAutofill_allowed CTS test.

Added a small delay to let settings save before checking its value.

Bug: 37659751
Test: cts-tradefed run cts -m CtsDevicePolicyManagerTestCases -t com.android.cts.devicepolicy.MixedManagedProfileOwnerTest#testDisallowAutofill_allowed
Change-Id: I960a4e4c42233402b3dea2d9889bae9998d7587c
1 file changed