LibWeb: Prevent checkboxes from firing change events when losing focus

This is because toggling the checkbox is committing the value.

Libraries/LibWeb/HTML/HTMLInputElement.cpp

@@ -637,6 +637,7 @@ void HTMLInputElement::commit_pending_changes()
     case TypeAttributeState::Telephone:
     case TypeAttributeState::Text:
     case TypeAttributeState::URL:
+    case TypeAttributeState::Checkbox:
         if (!m_has_uncommitted_changes)
             return;
         break;