Increase the minerfund IFP reward

Summary:
Bump the IFP reward starting on November 15, 2023.
This is done to maintain enough earnings for keeping the eCash project
moving forward despite the price getting lower during the bear market.

Test Plan:

ninja check-extended

Reviewers: #bitcoin_abc, Mengerian, PiRK

Reviewed By: #bitcoin_abc, Mengerian, PiRK

Subscribers: majcosta, tobias_ruck, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D14066