Revert "Add back "production" as default build mode"

This reverts commit bf9f5f4. Resolving this properly is likely the last fix needed to complete juice-shop#2173

package.json

@@ -48,7 +48,7 @@
     "..."
   ],
   "scripts": {
-    "build:frontend": "cd frontend && ng build --configuration production --output-hashing=none --vendor-chunk=true --source-map=false",
+    "build:frontend": "cd frontend && ng build --output-hashing=none --vendor-chunk=true --source-map=false",
     "build:server": "tsc",
     "cypress:open": "cypress open",
     "cypress:run": "cypress run",