fix(theming): read image keys from Mime-suffixed key in theming:config

[shawon9324]

• Resolves: [Bug]: occ theming:config <imageKey>` reads from wrong storage key #60173

Summary

Running occ theming:config logo reported that the logo was not set, even
though theming.logoMime was correctly set to image/png. The single-key
image read path was the only branch using the wrong storage key; the list-all
image branch and the image write path already correctly appended the Mime
suffix. This change updates that lookup to use the correct image MIME
configuration key.

Verified on a local instance with theming.logoMime set to image/png:

# before this change:
$ occ theming:config logo
logo is currently not set

# after this change:
$ occ theming:config logo
logo is currently set to image/png

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable
• Labels added where applicable
• Milestone added for target branch/version

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[Copilot]

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Pull request overview

Fixes occ theming:config <imageKey> so single-key reads use the MIME-suffixed config key (e.g., logoMime) consistently with the image write path and the list-all branch.

Changes:

• Update UpdateConfig to read image keys from <key>Mime instead of <key>.
• Add PHPUnit coverage for regular key reads and image key MIME-suffixed reads.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
apps/theming/lib/Command/UpdateConfig.php	Fixes the config lookup for image keys by using the MIME-suffixed storage key.
apps/theming/tests/Command/UpdateConfigTest.php	Adds unit tests validating the corrected lookup behavior for regular and image keys.

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