chore: revert default env value

Author: TakSeBiegam

packages/cli/package.json

@@ -15,7 +15,7 @@
     "start": "npm run clean && tspc --build tsconfig.build.json --watch",
     "clean": "rimraf lib/",
     "editor": "zeus https://project-api.graphqleditor.com/graphql ./src -n --es",
-    "update": "zeus ${GRAPHQL_EDITOR_HOST:-https://project-api.graphqleditor.com/graphql} ./src -n --es",
+    "update": "zeus $GRAPHQL_EDITOR_HOST ./src -n --es",
     "shared": "imp sync",
     "cli": "node lib/index.js"
   },