fix incorrect parameter name in metal3 fullstack job

Change-Id: Id061e5c8bff3b59e46494af99f062a921248d1fe
diff --git a/jjb/metal3/job_main_fullstack_building.yml b/jjb/metal3/job_main_fullstack_building.yml
index 7a11ca9..fbb3ecd 100644
--- a/jjb/metal3/job_main_fullstack_building.yml
+++ b/jjb/metal3/job_main_fullstack_building.yml
@@ -102,7 +102,7 @@
         default: false
         description: 'Enable or disable CAPI local building (disabled by default)'
     - string:
-        name: BMO_REPO
+        name: BMOREPO
         default: 'https://github.com/metal3-io/baremetal-operator.git'
         description: 'The Git reposiotry used to build BMO'
     - string: