Fixed {{movable}} stopping text input selection and allowing drag of dropdown elems

no issue

- stops drag from being initiated from any element that matches `input` or `.ember-basic-dropdown-trigger` so that text can still be selected from inputs whilst dragging and we don't get left with orphaned dropdowns from dragging a dropdown-inducing element

ghost/admin/app/modifiers/movable.js

@@ -62,6 +62,10 @@ export default class MovableModifier extends Modifier {
             }
 
             for (const elem of (e.path || e.composedPath())) {
+                if (elem.matches('input, .ember-basic-dropdown-trigger')) {
+                    break;
+                }
+
                 if (elem === this.element) {
                     this.addActiveEventListeners();
                     break;