ServiceBluetoothRoboTest: move to test_current

We cannot use module api when being a test because song does not allow
us.
Replacing the module only Setting.Global by hard copying the string into
the code.

Flag: TEST_ONLY
Test: atest ServiceBluetoothRoboTest
Bug: 347766369
Change-Id: Ib654c2a4c1bf6ff0827eb00b5d521a39fd3a3970