Fix bug in aether-roc-gui Helm chart

Change-Id: I04811ff472e3e4f59d4b421ed457a61e9ca13586
diff --git a/aether-roc-gui/templates/deployment.yaml b/aether-roc-gui/templates/deployment.yaml
index 1eaa906..d4ccab9 100644
--- a/aether-roc-gui/templates/deployment.yaml
+++ b/aether-roc-gui/templates/deployment.yaml
@@ -37,7 +37,7 @@
         - name: {{ .Chart.Name }}
           securityContext:
             {{- toYaml .Values.securityContext | nindent 12 }}
-          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          image: "{{ .Values.image.repository }}:{{ tpl .Values.image.tag . }}"
           imagePullPolicy: {{ .Values.image.pullPolicy }}
           env:
             - name: NAMESPACE