dir/gcp: remove mistakenly added modd.conf
dir/gcp: remove mistakenly added modd.conf

Change-Id: I9e5feec3faac3615fd69a3f3382b13d4c543dcbc
Reviewed-on: https://upspin-review.googlesource.com/2750
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@google.com>

upspin/upspin,upspin/upspin