tp: remove hack of stripping prefix for --run-metric files
tp: remove hack of stripping prefix for --run-metric files

We had a long standing hack of removing any prefix to protos/perfetto
in trace processor but now, with descriptor generation at compile time,
we don't need to do this anymore.

Bug: 168582819
Change-Id: Ib5b745ddd3294adadb88b5ff608729304cfad6f4
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto