Update metering InstallModes to support SingleNamespace

metering-operator doesn't support watching namespaces other than it's
own, but this is required for OLM validation to not error

Author: Chance Zibolski

deploy/chart/catalog_resources/rh-operators/metering-operator.v0.12.0.clusterserviceversion.yaml

@@ -28,7 +28,7 @@ spec:
   - type: OwnNamespace
     supported: true
   - type: SingleNamespace
-    supported: false
+    supported: true
   - type: MultiNamespace
     supported: false
   - type: AllNamespaces