nexus repository manager template proxy-route.yaml uses wrong targetPort

[rubenst2013]

• The port on the service is hard coded as 'nexus-ui'
• The proxy-route.yaml uses the template 'nexus.fullname'.

These two never match! 😢
(unless fullNameOverride is set to 'nexus-ui' as well - resulting in spreading that string over all its resources)

Possible solution could be to either hard code both as 'nexus-ui' or introduce a variable 'nexusProxyRoute.portName' with a default value of 'nexus-ui'