[stable/chronograf] Fix GH_CLIENT_ID environment variable name in deployment (#861)

stable/chronograf/Chart.yaml

 name: chronograf
-version: 0.2.0
+version: 0.2.1
 description: Open-source web application written in Go and React.js that provides the tools to visualize your monitoring data and easily create alerting and automation rules.
 keywords:
 - chronograf

stable/chronograf/templates/deployment.yaml

@@ -26,7 +26,7 @@ spec:
               name: {{ template "fullname" . }}
               key: token_secret
 {{- if .Values.oauth.github.enabled}}
-        - name: GH_CLIENT_IDx
+        - name: GH_CLIENT_ID
           valueFrom:
             secretKeyRef:
               name: {{ template "fullname" . }}
@@ -105,4 +105,4 @@ spec:
             claimName: {{ template "fullname" . }}
         {{ else }}
           emptyDir: {}
-        {{ end }}
\ No newline at end of file
+        {{ end }}