[skolo] Remove skia-rpi2-rack4-shelf4-004 from hosts.yml
[skolo] Remove skia-rpi2-rack4-shelf4-004 from hosts.yml

Change-Id: Ief5c7fcc1cd0dc7e06aa83589f415ecff76ef375
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/467525
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot