webapp-config: upgraded package to upstream

Upgraded app-admin/webapp-config to version 1.50.16-r4 on amd64

This package is required by Django. The CL was autogenerated by
cros_portage_upgrade.

BUG=chromium:236471
TEST=NONE

Change-Id: I5c5895e1989f7bb9e123cf61000fcbaebb1e0d25
Reviewed-on: https://gerrit.chromium.org/gerrit/50212
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
9 files changed