Fix tslint path

frontend/package.json

@@ -126,7 +126,7 @@
     "pretest": "./scripts/link_plugin_placeholder.js",
     "test": "ng test",
     "posttest": "npm run tslint_typechecks",
-    "tslint_typechecks": "tslint -p . -c tslint_typechecks.json",
+    "tslint_typechecks": "./node_modules/.bin/tslint -p . -c tslint_typechecks.json",
     "generate-typings": "tsc -d -p src/tsconfig.app.json",
     "legacy-webpack": "./node_modules/.bin/webpack --colors --config legacy/webpack.config.js",
     "legacy-webpack-watch": "RAILS_ENV=development ./node_modules/.bin/webpack --config legacy/webpack.config.js --display-error-details --watch --colors --cache --debug"