[TECHNICAL-SUPPORT] LPS-33712 Layout Template plugins can not be deactivated

Hi Tamás,

@brianchandotcom has refactored this constant in https://github.com/liferay/liferay-portal/commit/28e769a890b3cf3b25c3a42f69edf916f28c9dd1

We have to use it as "pluginType" parameter, otherwise the updated PluginSettings won't be used/found, and the default settings will be loaded.

Best,
Tibor