MentionPresentationModel: use Title::equals()
MentionPresentationModel: use Title::equals()

Change-Id: Ib0c5b0f5649edef79cf7ad272eb207711af8608d

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo