[TYPO3-core] RFC Feature #7336: Improve usability of Constants Editor

[Jeff Segars]

Ingmar Schlecht wrote:
>  there seems to be a problem with selector boxes for selecting e.g.
> colors from a list (see screen shot). Besides the selector box
> there's a plain text field as well which keeps the old value even if
> I select a different one and the value I select is not saved when I
> press update.

Thanks for the testing Ingmar.  Working on a fix now.