Reuse nexus.fullname template in nexus.proxy-ks.name (#11083)

Get rid of double dash and use a shorter name when
the release name contains chart name

Signed-off-by: Sergei Ivanov <sergei_ivanov@mail.ru>

stable/sonatype-nexus/Chart.yaml

@@ -1,5 +1,5 @@
 name: sonatype-nexus
-version: 1.16.0
+version: 1.16.1
 appVersion: 3.15.2-01
 description: Sonatype Nexus is an open source repository manager
 keywords:

stable/sonatype-nexus/templates/_helpers.tpl

@@ -36,8 +36,7 @@ Create a default fully qualified name for proxy keystore secret.
 We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
 */}}
 {{- define "nexus.proxy-ks.name" -}}
-{{- $name := default .Chart.Name .Values.nameOverride -}}
-{{- printf "%s-%s-%s"  $name .Release.Name "-proxy-ks" | trunc 63 | trimSuffix "-" -}}
+{{- printf "%s-%s" (include "nexus.fullname" .) "proxy-ks" | trunc 63 | trimSuffix "-" -}}
 {{- end -}}
 
 {{/*  Manage the labels for each entity  */}}