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Change the assets path adaptive to device/deviceless tests.
The specification of assets path would not affect the test run, but would take effect when some screenshots mismatch and we'd like to upload the screenshots. Since device and deviceless tests do not share screenshot folder, we would have to adaptively specify that. Test: atest -c SpaRoboRNGTests Bug: 300278210 Change-Id: I09f10834d16eabcc10a0f027d525c8259d3d58e9