fix to hide open conversations after returning from search

How to test:

pre-requirement:
There are open conversations

without this commit:
1. go to search screen
2. go back to conversation list
-> all open conversations are listed below own conversations

with this commit:
1. go to search screen
2. go back to conversation list
-> only own conversations are listed

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/conversationlist/ConversationsListActivity.kt

@@ -592,7 +592,7 @@ class ConversationsListActivity :
 
                 override fun onMenuItemActionCollapse(item: MenuItem): Boolean {
                     adapter!!.setHeadersShown(false)
-                    if (!filterState.containsValue(true)) filterableConversationItems = searchableConversationItems
+                    if (!filterState.containsValue(true)) filterableConversationItems = conversationItemsWithHeader
                     adapter!!.updateDataSet(filterableConversationItems, false)
                     adapter!!.hideAllHeaders()
                     if (searchHelper != null) {