[mosquitto] Revert: Remove storage fields from configinc value (#1710)

[morremeyer]

Description of the change

This reverts commit 8d8dba0f15606778d2a8d550585c0a746bcb66cb which was breaking backwards compatibility.

Benefits

Fix for breaking compatibility in a minor version. If we want to go ahead and remove those defaults, that should be a 5.0.0 release.

Possible drawbacks

None known

Applicable issues

• fixes #1730.

Additional information

Checklist

• [x] Title of the PR starts with chart name (e.g. [home-assistant])
• [x] Chart version bumped in Chart.yaml according to semver.
• [x] Chart artifacthub.io/changes changelog annotation has been updated in Chart.yaml. See Artifact Hub documentation for more info.
• [x] Variables have been documented in the values.yaml file.

[bjw-s]

Hi, thanks for taking the time to create this PR, but as explained in the issue we do not want to set these defaults. Instead users should configure the storage configuration they require.