Koenig - Fixed card context menus sometimes being misplaced

refs https://github.com/TryGhost/Ghost/issues/9505
- sometimes the toolbar was not in a state to measure correctly during `didInsertElement` so the positioning was incorrect
- fixed by re-calculating width/height each time we want to show the toolbar

ghost/admin/lib/koenig-editor/addon/components/koenig-card.js

@@ -172,6 +172,8 @@ export default Component.extend({
     _showToolbar() {
         // only show a toolbar if we have one
         if (this.get('toolbar')) {
+            this._setToolbarProperties();
+
             if (!this.get('showToolbar') && !this._onMousemoveHandler) {
                 this._onMousemoveHandler = run.bind(this, this._handleMousemove);
                 window.addEventListener('mousemove', this._onMousemoveHandler);