[5.4] fix case mod_articles manifest

[heelc29]

Summary of Changes

all name in xml manifest are lowercase

Testing Instructions

check record in database #__extensions

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

you have to install or update (no patchtester)

Link to documentations

Please select:

• No documentation changes for docs.joomla.org needed
• No documentation changes for manual.joomla.org needed

[richard67]

I've verified that the module handled in this PR is the only one with the name in uppercase. All others (and other core extensions besides modules) have lowercase.

[sandewt]

I have tested this item ✅ successfully on 6348846

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