Fix an unwanted page reload when entering username and password in the basic authentication form

Prevent the default hyperlink action.

src/main/javascript/view/BasicAuthButton.js

@@ -20,7 +20,8 @@ SwaggerUi.Views.BasicAuthButton = Backbone.View.extend({
     'click #apply_basic_auth' : 'applyPassword'
   },
 
-  applyPassword: function(){
+  applyPassword: function(event){
+    event.preventDefault();
     var username = $('#input_username').val();
     var password = $('#input_password').val();
     var basicAuth = new SwaggerClient.PasswordAuthorization('basic', username, password);