Edited the environment variable for cloud functions. (#374)

Author: shweta345

functions/firestore-export/index.js

@@ -10,7 +10,7 @@ exports.scheduledFirestoreExport = functions.pubsub
 .schedule('every 24 hours')
 .onRun((context) => {
 
-const projectId = process.env.GCP_PROJECT || process.env.GCLOUD_PROJECT;
+const projectId = process.env.GCP_PROJECT;
 const databaseName =
 client.databasePath(projectId, '(default)');