nfsPermissionFixer toYaml breaks installation

!165 (merged) added securityContext commonality, but the nfsPermissionFixer portion is nonfunctional.

test:

helm install --dry-run confluence -n test oci://registry1.dso.mil/bigbang/confluence --version 1.21.4-bb.5 --set volumes.sharedHome.nfsPermissionFixer.enabled=true
Pulled: registry1.dso.mil/bigbang/confluence:1.21.4-bb.5
Digest: sha256:e4f2dc40f792a966e2795b63df3285adf7172ad1da71e21288eed07664cc22c4
Error: INSTALLATION FAILED: template: confluence/templates/statefulset.yaml:120:14: executing "confluence/templates/statefulset.yaml" at <toYaml>: wrong number of args for toYaml: want 1 got 4

nfsPermissionFixer should be able to be enabled.