Use the staging release image as default image

Also, clean up some unnecessary default values

Change-Id: I8174a606a4f7da8ec602ed4074edae2630f023ae
diff --git a/omec/omec-control-plane/Chart.yaml b/omec/omec-control-plane/Chart.yaml
index c01a2c1..f328456 100644
--- a/omec/omec-control-plane/Chart.yaml
+++ b/omec/omec-control-plane/Chart.yaml
@@ -10,4 +10,4 @@
 name: omec-control-plane
 icon: https://guide.opencord.org/logos/cord.svg
 
-version: 0.6.13
+version: 0.6.14