fix(chart): reference the correct value for the Jetstream domain

Pull the `jetstreamDomain` value from `config.wadm.nats.jetstreamDomain`
instead of from `config.wadm.jetstreamDomain` since that is what we
define in the values file. It is also a more logical way to group the
value than what the chart was expecting.

Signed-off-by: Dan Norris <protochron@users.noreply.github.com>

charts/wadm/templates/deployment.yaml

@@ -56,9 +56,9 @@ spec:
             - name: WADM_TRACING_ENDPOINT
               value: {{ .Values.wadm.config.tracingEndpoint | quote }}
           {{- end }}
-          {{- if .Values.wadm.config.jetstreamDomain }}
+          {{- if .Values.wadm.config.nats.jetstreamDomain }}
             - name: WADM_JETSTREAM_DOMAIN
-              value: {{ .Values.wadm.config.jetstreamDomain | quote }}
+              value: {{ .Values.wadm.config.nats.jetstreamDomain | quote }}
           {{- end }}
           {{- if .Values.wadm.config.maxJobs }}
             - name: WADM_MAX_JOBS