[5.2]Add option for show/hide title in readmore

[rdeutz]

Pull Request for Issue #34609 .

Summary of Changes

Adding an option to the newsflash module to show, hide use global setting for the text at the read more button

Testing Instructions

1. Read the issue and confirm the issue on Joomla 5.2 with sample data
2. apply patch
3. go to the "Latest Posts" module
4. change the "Read More with Title" options in the module and check if the hide/show have the effect we want
5. change the "Read More with Title" options in the module to "Use global article settings"
6. go to content -> options and change under articles the Read More with Title and check if the hide/show have the effect we want

Actual result BEFORE applying this Pull Request

See issue

Expected result AFTER applying this Pull Request

You can control from the newflash module what text is at the read more button in the newsflash module

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