Fix ObjectStorage resources block required even when empty

[vulkoingim]

Description

This should fix the issue with generating the configuration for kots: https://werft.gitpod-dev.com/job/gitpod-build-main.3347 introduced in #10158

STDOUT: make: Entering directory '/workspace/install/kots'
Generating Base64 logo and saving to manifests/kots-app.yaml
make: Leaving directory '/workspace/install/kots'

STDERR: {
  "valid": false,
  "fatal": [
    "Field 'Config.ObjectStorage.Resources.Requests' is required"
  ]
}
configuration is invalid

Release Notes

NONE

[corneliusludmann]

/werft run publish-to-kots

👍 started the job as gitpod-build-aa-minio-resources-fix.1
(with .werft/ from main)