🐛 Fixed tag/author removal in post settings removing multiple tags/authors

closes https://github.com/TryGhost/Ghost/issues/9575
- in 6a3cfc2ca8 an `onmouseover` event handler was added for the close button in token input options which resulted in double firing in some circumstances where our code fired then the ember-power-select removal event handler also fired

ghost/admin/app/components/gh-token-input/trigger.js

@@ -12,10 +12,12 @@ export default EmberPowerSelectMultipleTrigger.extend({
         },
 
         handleOptionMouseDown(event) {
+            if (!event.target.closest('[data-selected-index]')) {
                 let action = this.get('extra.optionMouseDown');
                 if (action) {
                     return action(event);
                 }
+            }
         },
 
         handleOptionTouchStart(event) {

ghost/admin/app/templates/components/gh-token-input/trigger.hbs

@@ -27,7 +27,6 @@
                     aria-label="remove element"
                     class="ember-power-select-multiple-remove-btn"
                     data-selected-index={{idx}}
-                    onmousedown={{action "chooseOption" opt}}
                 >
                     {{svg-jar "close" data-selected-index=idx}}
                 </span>