Clean up code

No need for 'toggleable-watcher' if it's always toggleable.

src/Monitoring/ThreadWatcher.coffee

@@ -38,7 +38,6 @@ ThreadWatcher =
       @dialog.hidden = true
     
     Header.addShortcut 'watcher', sc, 510
-    $.addClass doc, 'toggleable-watcher'
 
     ThreadWatcher.fetchAuto()
 

src/css/style.css

@@ -931,9 +931,6 @@ span.hide-announcement {
 #thread-watcher a {
   text-decoration: none;
 }
-:root:not(.toggleable-watcher) #thread-watcher .move > .close {
-  display: none;
-}
 #thread-watcher .move > .close {
   position: absolute;
   right: 0px;