Remove unnecessary permissions from Traceur

This change removes the privapp allowlist from Traceur, which had
previously explicitly granted the DUMP, QUERY_ALL_PACKAGES,
START_FOREGROUND_SERVICES_FROM_BACKGROUND, and STATUS_BAR permissions.
These permissions no longer need to be granted because Traceur is now a
platform app.

Bug: 209476712
Test: - Checked that Traceur can still take normal and long traces on
        AOSP userdebug and internal user/userdebug.
      - Checked that bugreports will stop ongoing traces.
      - Checked that the quick settings tile still stops/starts traces.
Change-Id: I33cd317f9fe00e2e08ae205a832237bfe0df044a
Merged-In: I33cd317f9fe00e2e08ae205a832237bfe0df044a