Run test: Remove on-device signal_dumper detection

The ART APEX is already first on the $PATH and should always exist.
Just let the usual path lookup logic find the signal_dumper binary.

Test: ./art/test.py -b -r --optimizing --64 001-HelloWorld
Change-Id: Id54750bc1d3ca9d6ba74dad69fab1459ec4b39a5
1 file changed