Fix wiki revision pagination (#31760) (#31772)

Backport #31760 by @lunny

Fix #31755

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

routers/web/repo/wiki.go

@@ -410,6 +410,7 @@ func renderRevisionPage(ctx *context.Context) (*git.Repository, *git.TreeEntry)
 
 	pager := context.NewPagination(int(commitsCount), setting.Git.CommitsRangeSize, page, 5)
 	pager.SetDefaultParams(ctx)
+	pager.AddParamString("action", "_revision")
 	ctx.Data["Page"] = pager
 
 	return wikiRepo, entry