Log the application uid in PipUiEventLogger

Regression from ag/12132203, we should log the application uid instead
of the running user id.

Bug: 168342514
Test: $ANDROID_HOST_OUT/bin/statsd_testdrive -terse 90
Change-Id: If5d1bfe9ce38ea21bb9e5e13f51622f732dd85b9
2 files changed