bot_update: add /chrome-internal/trunk/src-internal to RECOGNIZED_PATHS
bot_update: add /chrome-internal/trunk/src-internal to RECOGNIZED_PATHS

The script already contains references to chrome-internal, and when running
under remote_run we have no access to hacky build_internal checkout.

BUG=593999, 584079

Review-Url: https://codereview.chromium.org/2101573002

primiano/depot_tools,primiano/depot_tools,CoherentLabs/depot_tools,CoherentLabs/depot_tools,primiano/depot_tools