Install printer-driver-brlaser

In WhisperBack 4c8277284f75ba6002f57aadf08ffb80 a user tried adding their Brother HL-1110 printer, but it would only print empty images. Apparently the printer-driver-brlaser package contains a proper driver for this printer, and we don't install it yet, so probably the user ended up with a generic driver which just isn't working in this situation. So let's install the proper driver.

And maybe we can consider installing some other printer-driver-* packages.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information