updater: Fix MinVersion logic
updater: Fix MinVersion logic

- The app version should be before the MinVersion to be skipped, not the
  reverse.
- If an image is skipped it should actually be skipped.

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>
benbjohnson/flynn,lmars/flynn,philiplb/flynn,benbjohnson/flynn,lmars/flynn,lmars/flynn,benbjohnson/flynn,philiplb/flynn,flynn/flynn,benbjohnson/flynn,philiplb/flynn,flynn/flynn,flynn/flynn,benbjohnson/flynn,philiplb/flynn,lmars/flynn,flynn/flynn,flynn/flynn,lmars/flynn,philiplb/flynn,benbjohnson/flynn