[4.0] Code Simplify For Article view

[joomdonation]

Pull Request for Issue # .

Summary of Changes

This PR improves code of Article view abit:

• Use a standard way to check if the current active menu item is linked to article (same with code on other places, not use strpos like before.
• Remove repeating code (the case for there is no active menu item and active menu item is not linked to article is the same, can be moved into single else block)

Testing Instructions

1. Apply patch
2. Access to an article on the site. Make sure it is still working as before

Alternative, code review should be enough.

[toivo]

I have tested this item ✅ successfully on 22f97ef

Tested successfully in Beta8-dev of 27 February using PHP 8.0.2.

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[ceford]

I have tested this item ✅ successfully on 22f97ef

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[joomdonation]

Could someone mark this PR as RTC so that it could be merged if it is possible? There is still bad code in the view and I want to work on further clean up after this one get merged. Thanks !

[alikon]

RTC

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