Fix overriding for gif images in themes for CLI scripts

[VicDeo]

Description

Related Issue

• Fixes Theming: overriding is broken for gif images #31804

Motivation and Context

Fixes overriding logo for emails that are sent from CLI

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

Open tasks:

• Backport (if applicable set "backport-request" label and remove when the backport was done)

[codecov]

Codecov Report

Merging #31990 into master will increase coverage by 0.31%.
The diff coverage is 73.91%.

@@             Coverage Diff              @@
##             master   #31990      +/-   ##
============================================
+ Coverage     63.51%   63.83%   +0.31%     
  Complexity    18554    18554              
============================================
  Files          1169     1169              
  Lines         69719    69727       +8     
  Branches       1264     1264              
============================================
+ Hits          44285    44511     +226     
+ Misses        25065    24847     -218     
  Partials        369      369

Flag	Coverage Δ	Complexity Δ
#javascript	52.59% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.12% <73.91%> (+0.35%)	18554 <0> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
lib/base.php	5.91% <ø> (ø)	126 <0> (ø)	⬇️
lib/private/Server.php	86.37% <100%> (+0.01%)	253 <0> (ø)	⬇️
lib/private/URLGenerator.php	89.02% <71.42%> (-2.98%)	35 <0> (ø)
lib/private/Helper/EnvironmentHelper.php	66.66% <0%> (+33.33%)	3% <0%> (ø)	⬇️
apps/files_external/lib/Lib/Storage/Swift.php	66.16% <0%> (+66.16%)	0% <0%> (ø)	⬇️

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[VicDeo]

@ownclouders rebase

[ownclouders]

Hey! I'm GitMate.io! This pull request is being rebased automatically. Please DO NOT push while rebase is in progress or your changes would be lost permanently ⚠️

[ownclouders]

Automated rebase with GitMate.io was successful! 🎉

[PVince81]

Code looks good and makes sense 👍

[PVince81]

@VicDeo please backport

[VicDeo]

stable10: #32131

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.