Fix DataWidget to allow titles to be overwritten

See https://talk.tiddlywiki.org/t/can-innerwiki-only-show-exactly-current-wiki/10452/5

core/modules/widgets/data.js

@@ -123,7 +123,6 @@ DataWidget.prototype.computeDataTiddlerValues = function() {
 		}
 	} else {
 		// Apply the item fields to each of the tiddlers
-		delete item.title; // Do not overwrite the title
 		if(Object.keys(item).length > 0) {
 			$tw.utils.each(tiddlers,function(tiddler,index) {
 				tiddlers[index] = new $tw.Tiddler(tiddler,item);