Improve handling of $link widget's draggable="no" (#9262)

* fix to to improve browser's compliance with user's intent when the widget's draggable attribute is set to no

* Update link.js with comments from the PR review

indentation changed from spaces to tabs
modified else statement into a else if statement for additional specificity

---------

Co-authored-by: Frédéric Demers <fastfreddy@fdemers.ca>

core/modules/widgets/link.js

@@ -147,6 +147,8 @@ LinkWidget.prototype.renderLink = function(parent,nextSibling) {
 			dragTiddlerFn: function() {return self.to;},
 			widget: this
 		});
+	} else if(this.draggable === "no") {
+		domNode.setAttribute("draggable","false");
 	}
 	// Assign data- attributes
 	this.assignAttributes(domNode,{