Robin Ward f5bdbd347e Revert "FIX: Discobot has not been created with our custom avatar."
This reverts commit 1062dbc3e9cbf9370803c0acea55eb3c054060ca.

Looks like it's causing some errors on migration.

```
/var/www/discourse/lib/image_sizer.rb:6:in `resize'
/var/www/discourse/lib/upload_creator.rb:120:in `block in create_for'
/var/www/discourse/lib/distributed_mutex.rb:33:in `block in synchronize'
/var/www/discourse/lib/distributed_mutex.rb:29:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:29:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:14:in `synchronize'
/var/www/discourse/lib/upload_creator.rb:37:in `create_for'
```
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