Add button type to et2_buttons in order to stop default browser submit behavior

-Fix addressbook and tracker nm search opens new popup

etemplate/js/et2_extension_nextmatch.js

@@ -2085,6 +2085,7 @@ var et2_nextmatch_header_bar = et2_DOMWidget.extend(et2_INextmatchHeader,
 			.on("keypress", function(event) {
 				if(event.which == 13)
 				{
+					event.preventDefault();
 					self.getInstanceManager().autocomplete_fixer();
 					self.nextmatch.applyFilters({search: self.search.getValue()});
 				}

etemplate/js/et2_widget_button.js

@@ -99,7 +99,8 @@ var et2_button = et2_baseWidget.extend([et2_IInput, et2_IDetachedDOM],
 		if (!this.options.readonly)
 		{
 			this.btn = $j(document.createElement("button"))
-				.addClass("et2_button et2_button_text");
+				.addClass("et2_button et2_button_text")
+				.attr({type:"button"});
 			this.setDOMNode(this.btn[0]);
 		}
 	},