Change to using sysprop for libgui_tests

The configstore service was deprecated. So change to use sysprop
instead of configstore

Bug: 124531214
Test: atest SurfaceTest#CreateSurfaceReturnsErrorBadClient &&
      check reading property values
Change-Id: I1825a304c4fe40e3ef9f54e1e8fef05b1f9a2e8f
Merged-In: I1825a304c4fe40e3ef9f54e1e8fef05b1f9a2e8f
(cherry picked from commit e6e7d44e)