[ci] Change testing platform from electron to firefox

Author: evilaliv3

client/package.json

@@ -2,7 +2,7 @@
   "name": "globaleaks",
   "version": "5.0.18",
   "scripts": {
-    "test": "npx cypress run && npx nyc report --reporter=lcov --report-dir=./cypress/coverage --reporter=text-summary --browser electron",
+    "test": "npx cypress run && npx nyc report --reporter=lcov --report-dir=./cypress/coverage --reporter=text-summary --browser firefox",
     "eslint": "ng lint",
     "stylelint": "npx stylelint 'app/css/**/*.css'"
   },