Chat Screen: Bug fix - Hide expanded header when keyboard appears.
Chat Screen: Bug fix - Hide expanded header when keyboard appears.

+ Hide keyboard when header is expanded.

vector-im/riot-ios,vector-im/vector-ios,vector-im/vector-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/riot-ios