Remove unused css

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/behaviors.scss

@@ -4,20 +4,3 @@
 .js-details-container .content.hide { display: block; }
 .js-details-container.open .content { display: block; }
 .js-details-container.open .content.hide { display: none; }
-
-// Toggler
-//--------
-.write-preview-btn .turn-on  { display: inherit; }
-.write-preview-btn .turn-off { display: none; }
-
-.js-toggler-container .turn-off { display: none; }
-.js-toggler-container.on .turn-on  { display: none; }
-.js-toggler-container.on .turn-off { display: inherit; }
-
-.js-toggler-container.on ~ .note-form-actions { 
-	.write-preview-btn .turn-on { display: none; }
-}
-
-.js-toggler-container.on ~ .note-form-actions { 
-	.write-preview-btn .turn-off { display: inherit; }
-}