[BUGFIX] EM: Upload icon -> inline form

Fixes inline loading upload form for extensions in EM.

Resolves: #62342
Releases: master
Change-Id: I6fd61b15b3aadcef117c2e554cf8e54460aba296
Reviewed-on: http://review.typo3.org/33443
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>