Update omv-ci.yml

Author: pgleeson

.github/workflows/omv-ci.yml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: [ 3.7, 3.9 ]
-        engine: [ NjNeuroML_NEURON, jNeuroML_validate ]
+        engine: [ jNeuroML_NEURON, jNeuroML_validate ]
 
     steps:
     - uses: actions/checkout@v2