[3.9][com_content featured] Remove redundant intro_image check

[ReLater]

Summary of Changes

• Remove lines for check if intro image exists because this is done in JLayout already.

Testing Instructions

Code review in pr plus code of JLayout joomla.content.intro_image https://github.com/joomla/joomla-cms/blob/staging/layouts/joomla/content/intro_image.php#L14

Or:

• Create some featured articles with and without intro images.
• Test that nothing has changed after applying the patch. Intro images are displayed or not.

Expected result

• Nothing has changed.

Actual result

• Unnecessary/redundant code.

[SharkyKZ]

I have tested this item ✅ successfully on 6a91da1

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[Quy]

I have tested this item ✅ successfully on 0e99716

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/24389.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/24389.}

[HLeithner]

thx