[Editor] Unselect correctly removed editors

- After undoing a deletion of several editors, they appeared to be selected (they had a red border)
when in fact they were not, consequently, this patch aims to remove the selectedEditor class when
an editor is removed;
- Add a test with some ink editors.

test/integration-boot.js

@@ -31,6 +31,7 @@ async function runTests(results) {
       "accessibility_spec.js",
       "find_spec.js",
       "freetext_editor_spec.js",
+      "ink_editor_spec.js",
     ],
   });