change src/qt/res/src/bitcoin.svg to upward tilting version

Summary:
Change bitcoin logo to upward tilting version

Part of task T59

Test Plan: Build and install, look at graphics to make sure they look good

Reviewers: freetrader, dagurval, #bitcoin_abc, Mengerian, CCulianu

Reviewed By: #bitcoin_abc, CCulianu

Subscribers: CCulianu

Differential Revision: https://reviews.bitcoinabc.org/D393