[e.cash] Replace Pay2Stay logo

Summary: Pay2Stay rep asked me to replace the logo with this version that's in line with their branding

Test Plan: Run it locally, see that it looks good.

Reviewers: #bitcoin_abc, tobias_ruck, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D17606