fix(argo-rollouts): controller replicas count comparison

[jmeridth]

Fixes: #2308

Cast to int since default from values.yaml is int64 not int

Before

➜  helm install argo-rollouts . -n argo-rollouts --set controller.replicas=2 --dry-run                                                                                     

Error: INSTALLATION FAILED: template: argo-rollouts/templates/controller/deployment.yaml:51:15: executing "argo-rollouts/templates/controller/deployment.yaml" at <gt .Values.controller.replicas 1.0>: error calling gt: incompatible types for comparison

After

# Source: argo-rollouts/templates/controller/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: argo-rollouts
  namespace: "argo-rollouts"
  labels:
    app.kubernetes.io/component: rollouts-controller
    helm.sh/chart: argo-rollouts-2.32.1
    app.kubernetes.io/name: argo-rollouts
    app.kubernetes.io/instance: argo-rollouts
    app.kubernetes.io/version: "v1.6.0"
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/part-of: argo-rollouts
spec:
  selector:
    matchLabels:
      app.kubernetes.io/component: rollouts-controller
      app.kubernetes.io/name: argo-rollouts
      app.kubernetes.io/instance: argo-rollouts
  strategy:
    type: Recreate
  replicas: 2
  template:
    metadata:
      labels:
        app.kubernetes.io/name: argo-rollouts
        app.kubernetes.io/instance: argo-rollouts
        app.kubernetes.io/component: rollouts-controller
    spec:
      serviceAccountName: argo-rollouts
      containers:
      - image: "quay.io/argoproj/argo-rollouts:v1.6.0"
        args:
        - --healthzPort=8080
        - --metricsport=8090
        - --leader-elect   <---- THIS IS THE IMPORTANT BIT
        imagePullPolicy: IfNotPresent

Checklist:

• I have bumped the chart version according to versioning
• I have updated the documentation according to documentation
• I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• Any new values are backwards compatible and/or have sensible default.
• I have signed off all my commits as required by DCO.
• My build is green (troubleshooting builds).

[yu-croco]

Thank you!🚀