Switch back user to the initial user in teardown().

CtsDevicePolicyManagerTestCases switches user from 10 to 0.
Switch back user to the initial user in teardown().

Bug: 141711863
Test: Step 1: run cts -m CtsDevicePolicyManagerTestCases
      Step 2: run cts -m CtsProviderTestCases
      Step 3: run cts -m CtsProviderUiTestCases
Signed-off-by: fanzha3x <fanx.zhang@intel.com>

Change-Id: Ifd2a1bb9a31516fb7ae4d6e826ba54db8bbe1bde
(cherry picked from commit e96c0ec3bc22e23bb204d4ceab294a53b8e61041)
Merged-In: Ifd2a1bb9a31516fb7ae4d6e826ba54db8bbe1bde
2 files changed