redundent metadata in dapr_service_injector_service.yaml

[beiwei30]

In what area(s)?

/area operator

What version of Dapr?

Output of git describe --dirty
v0.11.0-rc.2-12-gb84096b8

Expected Behavior

a redundant 'metadata' is defined under 'metadata' in charts/dapr/charts/dapr_sidecar_injector/templates/dapr_sidecar_injector_service.yaml

apiVersion: v1
kind: Service
metadata:
  metadata:
  name: dapr-sidecar-injector

Actual Behavior

I believe it should be

apiVersion: v1
kind: Service
metadata:
  name: dapr-sidecar-injector

Steps to Reproduce the Problem

RELEASE NOTE: REMOVE redundant 'metadata' in dapr_sidecar_injector_service.yaml.