Remove dead code

SetTool was a holdover from highlight mode days and doesn't do anything.

h/static/scripts/annotator/plugin/toolbar.coffee

@@ -15,7 +15,6 @@ class Annotator.Plugin.Toolbar extends Annotator.Plugin
   events:
     '.annotator-toolbar mouseenter': 'show'
     '.annotator-toolbar mouseleave': 'hide'
-    'setTool': 'onSetTool'
     'setVisibleHighlights': 'onSetVisibleHighlights'
 
   html: '<div class="annotator-toolbar annotator-hide"></div>'
@@ -72,13 +71,6 @@ class Annotator.Plugin.Toolbar extends Annotator.Plugin
 
   hide: -> this.toolbar.addClass('annotator-hide')
 
-  onSetTool: (name) ->
-    if name is 'highlight'
-      $(@buttons[2]).addClass(PUSHED_CLASS)
-    else
-      $(@buttons[2]).removeClass(PUSHED_CLASS)
-    this._updateStickyButtons()
-
   onSetVisibleHighlights: (state) ->
     if state
       $(@buttons[1]).addClass(PUSHED_CLASS)