[6.1] Remove default empty string param in addControlField()

[Denitz]

Summary of Changes

New addControlField() method has $value as empty string by default, no sense to use empty string in method calls.

Testing Instructions

Apply patch.

Actual result BEFORE applying this Pull Request

useless default param in code

Expected result AFTER applying this Pull Request

No changes.

Link to documentations

Please select:

• [ ] Documentation link for docs.joomla.org:

• [x] No documentation changes for docs.joomla.org needed

• [ ] Pull Request link for manual.joomla.org:

• [x] No documentation changes for manual.joomla.org needed

[RickR2H]

I have tested this item :white_check_mark: successfully on 1fbc46d3e0e7b021b9c5a3c0e9b00eb261387afd

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[richard67]

Such bigger refactoring should not be done in a patch version, so this PR would have to be made for 6.1-dev, I think.

@softforge @Bodge-IT Please check and decide.

[softforge]

Its a good catch @Denitz but not a bug as such so we will need to move to 6.1 where it can go in the alpha and get lots of testing.