pricelist handlePriceChange only accepts updates if source is 'bptf'

[joekiller]

Describe the bug

When using a custom pricer the websocket based updates must have a source of 'bptf' to be accepted by handlePriceChange

tf2autobot/src/classes/Pricelist.ts

Line 1125 in 4489d31

if (data.source !== 'bptf') {

I'm unsure if this is guarding updates from elsewhere or what.

To Reproduce

Steps to reproduce the behavior:

1. make Websocket updates have a different source
2. no price update
3. ...

Expected behavior

A custom pricer websocket price update is applied.

Screenshots and logs

Additional context

Version: old as custom pricer