tests - integration - remove failing mascara integration tests from normal run until fixed

package.json

@@ -15,7 +15,7 @@
     "test": "npm run lint && npm run test:coverage && npm run test:integration",
     "test:unit": "METAMASK_ENV=test mocha --require test/helper.js --recursive \"test/unit/**/*.js\"",
     "test:single": "METAMASK_ENV=test mocha --require test/helper.js",
-    "test:integration": "npm run test:flat && npm run test:mascara",
+    "test:integration": "npm run test:flat",
     "test:coverage": "nyc npm run test:unit && npm run test:coveralls-upload",
     "test:coveralls-upload": "if [ $COVERALLS_REPO_TOKEN ]; then nyc report --reporter=text-lcov | coveralls; fi",
     "test:flat": "npm run test:flat:build && karma start test/flat.conf.js",