fluff: Fix revert coming from contribs if diffonly is used #914
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Fixes #913, same basic issue as #627/#628: if a user has "Do not show page content below diffs" selected in Special:Preferences, wgRevisionId is set to 0 on diffs. While #628 took care of that for the links on diff pages themselves, trying to rollback from a contribs page was left unfixed. Those links load the diff page then
auto
matically revert, so will run into the same issue. This essentialy reverts back to the check before 3e5ec5b (#561), albeit by usingmw.util.getParamValue
rather than the no-longer-existingMorebits.queryString.get
(#725).