Fix bug in wrapper chart

Logic in the wrapper template for helmRelease is broken as follows:

{{- $fluxSettings := mergeOverwrite $.Values.flux (dig "flux" dict $vals) -}}

If fluxSettings are passed in to the wrapper chart it overwrites the flux settings for the entire chart. If you specify a service account for wrapper it overrides for the entire big bang deployment. This logic should only supply the section to wrapper. Needs rework and testing

link to template -> https://repo1.dso.mil/big-bang/bigbang/-/blob/master/chart/templates/wrapper/helmrelease.yaml?ref_type=heads#L5