[BUGFIX] Escape element ID before used in jQuery selector

General information: to use any of the meta-characters as a
literal part of a jQuery selector, it must be escaped with
two backslashes: http://api.jquery.com/category/selectors/

Using IRRE (TCA type "inline") in Flexforms, TYPO3 may
generate HTML elements with IDs containing dots. Example:

id="data-104-tt_content-182-pi_flexform---data---fileSelection
---lDEF---settings.fileSelection.files---vDEF_records"

If you set "useSortable" and "endableControls.dragdrop" to 1
for an element in your Flexform configuration,
inline.createDragAndDropSorting(objectId) will get called for
that element. This objectId has to be escaped to be used as a
literal part of a jQuery selector later in this function.
Otherwise the drag-and-drop functionality will fail.

Resolves: #62676
Related: #62001
Releases: 6.2
Change-Id: I353a699d82885b7bd57d0dc5fafbb8f5646d693f
Reviewed-on: http://review.typo3.org/33777
Reviewed-by: Stefan Busemann <stefan.busemann@in2code.de>
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Alexander Opitz <opitz.alexander@googlemail.com>
Tested-by: Alexander Opitz <opitz.alexander@googlemail.com>