Remove useless interactive set when maximizing images

This doesn't seem to do anything, and it's not easy to turn it back when the popup is closed

@nvrwhere since it looks like you touched it? Do you know what it's supposed to do, because it doesn't seem to have any effect here

Prevents this runtime error:

qrc:/org/kde/neochat/qml/RoomPage.qml:289: Error: Cannot assign to non-existent property "messageListView"