fix: Drop use of deprecated jquery load

Signed-off-by: Julius Härtl <jus@bitgrid.net>

src/document.js

@@ -365,7 +365,7 @@ const documentsMain = {
 				}, 45000)
 			})
 
-			$('#loleafletframe').load(function() {
+			$('#loleafletframe').on('load', function() {
 				const ViewerToLool = [
 					'Action_FollowUser',
 					'Host_VersionRestore',