Use compile-time Unicode string conversion

Thanks to this syntax introduced in C++11, this reduces the amount of work
that needs to be performed at run-time while making the code more terse.

editor/script_create_dialog.cpp

@@ -348,7 +348,7 @@ void ScriptCreateDialog::_template_changed(int p_template) {
 		}
 	}
 	// Update template label information.
-	String template_info = String::utf8("•  ");
+	String template_info = U"•  ";
 	template_info += TTR("Template:");
 	template_info += " " + sinfo.name;
 	if (!sinfo.description.is_empty()) {