fix: helm podDisruptionBudget for controller-manager

[a7i]

What type of PR is this?
/kind bug

What this PR does / why we need it:

before

---
# Source: karmada/templates/karmada-controller-manager.yaml
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: karmada-controller-manager
  namespace: karmada-system
  labels:

    app: karmada-controller-manager
spec:
  selector:
    matchLabels:

      app: karmada-controller-manager

  maxUnavailable: 20%---  # <--- this is the issue
---

after:

---
# Source: karmada/templates/karmada-controller-manager.yaml
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: karmada-controller-manager
  namespace: karmada-system
  labels:

    app: karmada-controller-manager
spec:
  selector:
    matchLabels:

      app: karmada-controller-manager

  maxUnavailable: 20%
---

Which issue(s) this PR fixes:
N/A

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

fixed helm render of podDisruptionBudget in controller-manager

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (761e22e) 52.83% compared to head (5ef785d) 52.85%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4188      +/-   ##
==========================================
+ Coverage   52.83%   52.85%   +0.01%     
==========================================
  Files         239      239              
  Lines       23559    23559              
==========================================
+ Hits        12448    12451       +3     
+ Misses      10434    10432       -2     
+ Partials      677      676       -1     

Flag	Coverage Δ
unittests	52.85% <ø> (+0.01%)	⬆️

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see 1 file with indirect coverage changes

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[chaosi-zju]

/lgtm

[RainbowMango]

/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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