javascript: Do not bind the button click event

Catching form submit events is sufficient as catching the button click
event is not an option due to circumventing the browser's native form
validation logic otherwise.

refs #8349

public/js/icinga/events.js

@@ -118,8 +118,6 @@
             // Select a table row
             $(document).on('click', 'table.multiselect tr[href]', { self: this }, this.rowSelected);
 
-            $(document).on('click', 'button', { self: this }, this.submitForm);
-
             // We catch all form submit events
             $(document).on('submit', 'form', { self: this }, this.submitForm);