[4.0] Add aria-hidden

[Quy]

Summary of Changes`

Add aria-hidden to User Menu items

Testing Instructions

Code review
or
View page source
Check markup of User Menu dropdown

[1apweb]

I have tested this item ✅ successfully on 229b23e

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[SharkyKZ]

I have tested this item ✅ successfully on 229b23e

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/26737.}

[SharkyKZ]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/26737.}

[wilsonge]

Thanks!