[BREAKING CHANGE] icons: Remove 'wikitrail' icon, renamed in v0.20.1
[BREAKING CHANGE] icons: Remove 'wikitrail' icon, renamed in v0.20.1

Change-Id: I7635187698046eda96405a1e11672687938d9b62

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui