Fix default value for unhealthyPodEvictionPolicy

`Delete` isn't allowed as value here. Accepted values are `IfHealthyBudget` (default) and `AlwaysAllow`.

https://kubernetes.io/docs/tasks/run-application/configure-pdb/#unhealthy-pod-eviction-policy

Author: z0rc

charts/aws-efs-csi-driver/values.yaml

@@ -111,7 +111,7 @@ controller:
     enabled: false
     # maxUnavailable: 1
     minAvailable: 1
-    unhealthyPodEvictionPolicy: "Delete"
+    unhealthyPodEvictionPolicy: IfHealthyBudget
   # securityContext on the controller pod
   securityContext:
     runAsNonRoot: false