Add appId to unified search add filter event object

Due the need to group filters by app, in the core, it's neccesary that filters,
 it's neccesary that plugin filters come with a field that helps identify the app
 that sent in the filter.

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>

src/search.js

@@ -70,6 +70,7 @@ import '@nextcloud/dialogs/style.css'
 
 					emit('nextcloud:unified-search:add-filter', {
 						id: 'talk-message',
+						appId: 'spreed',
 						payload: conversation,
 						filterUpdateText: t('spreed', 'Search in conversation: {conversation}', { conversation: conversation.displayName }),
 						filterParams: { conversation: conversation.token }