chat view: don't attempt to redefine a Loader's final property

We can't define a property called `status` for a Loader as it exists already. At best, the app will crash as it should be unable to create the chat view. At worst, this will introduce undefined behavior by confounding transfer/loader status assignments and comparisons.

Gitlab: #1537 (crash)
Change-Id: I66fb6da25cae695f7f1f520200f6eed8a2c93d03