fix(ProfilePopup): make unblocking contacts/users work

There's a bug in the profile popup where we're calling an API that
actually doesn't exist. This commit fixes it by calling into the
correct `profileModel` member, to make unblocking users work.

ui/app/AppLayouts/Chat/components/ProfilePopup.qml

@@ -354,7 +354,7 @@ ModalPopup {
         UnblockContactConfirmationDialog {
             id: unblockContactConfirmationDialog
             onUnblockButtonClicked: {
-                profileModel.unblockContact(fromAuthor)
+                profileModel.contacts.unblockContact(fromAuthor)
                 unblockContactConfirmationDialog.close();
                 popup.close()
                 contactUnblocked(fromAuthor)