[BUGFIX] EM: Fetch list as html, not as json

After performing an update from TER currently the extension-list
is fetched as format=json. This however leads to that situation
that links in the list also have format=json and won't work
anymore (example: pagination-widget).

Change-Id: Id37ab27bb3acd821e9dc0cadb23978aa3e5d9784
Resolves: #53423
Releases: 6.2, 6.1, 6.0
Reviewed-on: https://review.typo3.org/25212
Reviewed-by: Pascal Dürsteler
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Tested-by: Pascal Dürsteler
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind

typo3/sysext/extensionmanager/Resources/Public/JavaScript/update.js

@@ -58,8 +58,8 @@
 
 				if (data.updated) {
 					$.ajax({
-						url: window.location.href + '&tx_extensionmanager_tools_extensionmanagerextensionmanager%5Bformat%5D=json',
-						dataType: 'json',
+						url: window.location.href,
+						dataType: 'html',
 						success: function(data) {
 							$('#terTableWrapper').html(
 								data