fix: remove required from sync fields — blocks save on existing tasks

Authored-by: Moko Consulting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/packages/plg_task_mokowaassync/forms/sync_params.xml

@@ -4,12 +4,12 @@
 		<field name="target_url" type="text"
 			label="PLG_TASK_MOKOWAASSYNC_TARGET_URL_LABEL"
 			description="PLG_TASK_MOKOWAASSYNC_TARGET_URL_DESC"
-			required="true"
+
 			hint="https://demo.example.com" />
 		<field name="api_token" type="text"
 			label="PLG_TASK_MOKOWAASSYNC_API_TOKEN_LABEL"
 			description="PLG_TASK_MOKOWAASSYNC_API_TOKEN_DESC"
-			required="true"
+
 			hint="Joomla API token for the target site" />
 		<field name="api_user" type="text"
 			label="PLG_TASK_MOKOWAASSYNC_API_USER_LABEL"