HPCC-30683 Fix planes bug when forcePermissions and numDevices>1

[jakesmith]

With forcePermissions was on and numDevices>1, the generated init container for forcePermissions, was not using the correct mount points.
As a consequence, the init container failed to initialize.

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Testing:

[github-actions]

https://track.hpccsystems.com/browse/HPCC-30683
Jira updated