WebDriver: Partial Implementation of Element Clear Endpoint

- Implemented sections 1, 2, and 3 of the Element Clear endpoint.
- Reordered Web::WebDriver::Error entries alphabetically.

Userland/Services/WebContent/WebDriverConnection.cpp

@@ -1520,7 +1520,7 @@ Messages::WebDriverClient::ElementClearResponse WebDriverConnection::element_cle
     dbgln("FIXME: WebDriverConnection::element_clear()");
 
     // 1. If element's innerHTML IDL attribute is an empty string do nothing and return.
-    auto* element = TRY(get_known_connected_element(element_id));
+    Web::DOM::Element* element = TRY(get_known_connected_element(element_id));
     if (!element) {
         return Web::WebDriver::Error::from_code(Web::WebDriver::ErrorCode::NoSuchElement, "Element not found");
     }