[BUGFIX] IE: make save button usable

Correctly handling of save button for IE.
Due to IE not supporting form attribute on button
the save button doesn't work currently.

Change-Id: Ica6bac13558f60c933be84df9a181bd5e227676c
Resolves: #71598
Releases: master
Reviewed-on: https://review.typo3.org/44734


Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>

typo3/sysext/backend/Resources/Public/JavaScript/SplitButtons.js

@@ -74,7 +74,7 @@ define(['jquery', 'TYPO3/CMS/Backend/Icons'], function($, Icons) {
 				});
 			});
 
-			if (e.currentTarget.tagName === 'A' && !e.isDefaultPrevented()) {
+			if ((e.currentTarget.tagName === 'A' || $me.attr('form')) && !e.isDefaultPrevented()) {
 				$form.submit();
 				e.preventDefault();
 			}