Revert "lint-updating z-index"

This reverts commit 0d8ea89.

package.json

@@ -56,7 +56,7 @@
     "globby": "^6.1.0",
     "jest": "^27.4.7",
     "jest-serializer-vue": "^3.1.0",
-    "kolibri-tools": "^0.15.4",
+    "kolibri-tools": "0.15.4",
     "lockr": "^0.8.4",
     "material-design-icons": "^3.0.1",
     "mock-match-media": "^0.4.2",

yarn.lock

@@ -8971,7 +8971,7 @@ known-css-properties@^0.11.0:
   resolved "https://registry.yarnpkg.com/known-css-properties/-/known-css-properties-0.11.0.tgz#0da784f115ea77c76b81536d7052e90ee6c86a8a"
   integrity sha512-bEZlJzXo5V/ApNNa5z375mJC6Nrz4vG43UgcSCrg2OHC+yuB6j0iDSrY7RQ/+PRofFB03wNIIt9iXIVLr4wc7w==
 
-kolibri-tools@^0.15.4:
+[email protected]:
   version "0.15.4"
   resolved "https://registry.yarnpkg.com/kolibri-tools/-/kolibri-tools-0.15.4.tgz#703745c36f08bf03c3fc6225691f52c64c1153fa"
   integrity sha512-7WHHJ0QN845mTsC/cDU1NyxonGYc2MYokCAQHNrjOkF9CSUxqHX5lnSxNgaAq1ADRk0iKPt0gYhUq1XCAAdOsw==