[build] replace the BCH logos in the Windows install wizard

Summary: These logos were missed during the rebranding.

Test Plan:
@bot build-win64

Download the articfact and execute it:

wine bitcoin-abc-x86_64-w64-mingw32.exe

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Maniphest Tasks: T2548

Differential Revision: https://reviews.bitcoinabc.org/D11726