Buffer Chests can cause requester chests not to show their requests on the circuit network

[Battle Pigeon]

Bug: If a buffer chest contains 3/4 (or more) of an item that IT requests, AND a requester chest requests 1/2 or less of the same requested item, then the request read by the circuit network will be 0.

Steps to reproduce:

1.Create an isolated logistics network.
2. Add a buffer chest, request B items, and add B/4 as many items as you requested to that chest.
3. Add a requester chest, and request B/2 items.
4. Read the requests from the circuit network.

Expected:
The circuit network will receive B + B/2 - 3B/4 = 3B/4 requests.

Actual:
The circuit network will receive B +B/2 - 3B/4 - 3B/4 = 0 requests.

Example 1

1. Request 400 rails in a buffer chest
2. Add 300 rails to the buffer chest
3. Request 200 rails in the requester chest

Expected:

400 buffer requested + 200 buffer held - 300 requester request = 300 requested rails

Actual:

400 + 200 - 300 -300 = 0 requested rails.

[Loewchen]

128924