Description of problem:

Setting up nodeSelector in restic section in the DPA applies extra "node-role.kubernetes.io/app" label to pod.

This causes some node-agent pods to not be scheduled as desired,as the pods have:

spec:
  nodeSelector:
    kubernetes.io/os: linux
    node-role.kubernetes.io/app:  

Version-Release number of selected component (if applicable):

OADP 1.3

How reproducible:

Always

Steps to Reproduce:
1. Configure DPA with nodeSeletor in restic section
2. Pods start with extra label in nodeSelector
3. 

Actual results:

Pods not running in all the desired nodes( Infra nodes)

Expected results:

Pods running with only the nodeSelector label

Additional info: