Change how volume types are defaulted

[drinkataco]

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name: Pull Request about: Create a pull request to contribute to the Helm chart collection

Description

Charts do not need to define default volumes - this is done now in the template file, fixing an issue where you had to otherwise nullify this in your own values.yaml file.

https://github.com/drinkataco/media-servarr/issues/28

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] Non-breaking change which adds functionality
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update