gddo-server: Change the env var name to get GCloud Project ID

Change-Id: I94122f950d5ccfd3a09613fc6de9b846a527fb3f
Reviewed-on: https://go-review.googlesource.com/43499
Reviewed-by: Sarah Adams <shadams@google.com>
diff --git a/gddo-server/config.go b/gddo-server/config.go
index 372e2b3..c335fe3 100644
--- a/gddo-server/config.go
+++ b/gddo-server/config.go
@@ -14,7 +14,7 @@
 )
 
 const (
-	gaeProjectEnvVar = "GAE_LONG_APP_ID"
+	gaeProjectEnvVar = "GCLOUD_PROJECT"
 )
 
 const (