fix test script

package.json

     "launch": "node lib/src/backend/Launcher.js",
     "start": "npm run build && npm run launch",
     "start-backend": "npm run build-backend && npm run launch",
-    "test": "npm run backend && npm run build-backend && mocha lib/test/backendTest.js",
+    "test": "npm run build-backend && npm run build-backend && mocha lib/test/backendTest.js",
     "build": "npm run build-backend && npm run build-frontend",
     "build-backend": "npm run clean-backend && tsc",
     "build-frontend": "npm run clean-frontend && (mkdir static || rm -rf static/*) && npm run build-dashboard",