fixed incorrect redis image tag

charts/redis/v3.0.2/questions.yml

@@ -20,13 +20,13 @@ questions:
     description: "Redis image tag"
     type: string
     label: Redis Image Tag
-  - variable: metrics.repository
+  - variable: metrics.image.repository
     default: "oliver006/redis_exporter"
     description: "Metrics image name"
     type: string
     label: Metrics Image Name
     show_if: "metrics.enabled=true"
-  - variable: image.tag
+  - variable: metrics.image.tag
     default: "v0.11"
     description: "Metrics image tag"
     type: string