TASK: Remove old placeholder patch

Author: markusguenther

package.json

@@ -9,8 +9,7 @@
     "moment": "^2.20.1",
     "vfile-message": "^2.0.2",
     "isemail@3.2.0": "patch:isemail@npm:3.2.0#./patches/isemail-npm-3.2.0-browserified.patch",
-    "react-codemirror2@7.2.1": "patch:react-codemirror2@npm:7.2.1#./patches/react-codemirror2-npm-7.2.1-browserified.patch",
-    "@ckeditor/ckeditor5-engine@^16.0.0": "patch:@ckeditor/ckeditor5-engine@npm:16.0.0#./patches/@ckeditor-ckeditor5-engine-npm-16.0.0-placeholder.patch"
+    "react-codemirror2@7.2.1": "patch:react-codemirror2@npm:7.2.1#./patches/react-codemirror2-npm-7.2.1-browserified.patch"
   },
   "scripts": {
     "lint": "tsc --noemit && stylelint 'packages/*/src/**/*.css' && yarn eslint 'packages/*/src/**/*.{js,jsx,ts,tsx}'",