[FIX] add livechat closeWidget api method

[cortopy]

Proposed changes (including videos or screenshots)

Livechat SDK onChatMinimized was not being triggered. It's not fixed

Issue(s)

Steps to test or reproduce

• Add a listener to the livechat widget with onChatMinimized. It won't get triggered
• After this fix, the events sent between parents will find the closeWidget api and event will propagate.
• Adding listener after the fix, will receive the event

Further comments