ViewSwitcher : use Button widget instead of LinkWidget (#5573)

core/wiki/viewswitcher.tid

@@ -7,9 +7,9 @@ $:/core/images/storyview-$(storyview)$
 <div class="tc-chooser tc-viewswitcher">
 <$list filter="[storyviews[]]" variable="storyview">
 <$set name="cls" filter="[<storyview>prefix{$:/view}]" value="tc-chooser-item tc-chosen" emptyValue="tc-chooser-item"><div class=<<cls>>>
-<$link to=<<storyview>>><$transclude tiddler=<<icon>>/><$text text=<<storyview>>/></$link>
+<$button tag="a" class="tc-tiddlylink tc-btn-invisible" to=<<storyview>>><$transclude tiddler=<<icon>>/><$text text=<<storyview>>/></$button>
 </div>
 </$set>
 </$list>
 </div>
-</$linkcatcher>
+</$linkcatcher>