[BUGFIX] Extension selector not displayed anymore

The extdeveval does not display the selector list of extensions
for quite a few functions. It only display the file selector,
which is not enough (an extension must be selected first).

Furthermore, the scope selector must be displayed for
"locallang XML to XLIFF" conversion too.

Resolves: #58507
Releases: 3.3
Change-Id: I6f5d63f4a80008f4536a0d755af73aefc11a8467
Reviewed-on: https://review.typo3.org/29863
Reviewed-by: Francois Suter
Tested-by: Francois Suter