Update SMTP user parameter to Google.Smtp.Username

Renamed the "Google.Smtp.User" parameter to "Google.Smtp.Username" in Default.runsettings for consistency and clarity. No other changes were made.

Author: gravity-api

test/Settings/Default.runsettings

@@ -13,7 +13,7 @@
 		<!-- Settings -->
 		<Parameter name="G4.Username" value="" />
 		<Parameter name="Google.Smtp.Password" value="" />
-		<Parameter name="Google.Smtp.User" value="" />
+		<Parameter name="Google.Smtp.Username" value="" />
 		<Parameter name="Integration" value="BrowserStack" />
 		<Parameter name="Integration.ApplicationUnderTest" value="http://localhost:9002/test/static/" />
 		<Parameter name="Integration.Selenium.Version" value ="4.8.0" />