[5.1] Dark Mode menu select toggle colour

[brianteeman]

final part Pull Request for Issue #43068 .

Summary of Changes

Change the colour of the icon in the treeselect for assigning modules to pages to satisfy contrast rules

Testing Instructions

see #43068 for more details

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[Quy]

I have tested this item ✅ successfully on d9bd44a

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[viocassel]

I have tested this item ✅ successfully on d9bd44a

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[Quy]

RTC

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[LadySolveig]

Thank you @brianteeman and also for testing @viocassel @Quy

[brianteeman]

thanks