6558f8acc [gui] Defer coin control instancing (João Barbosa)
Pull request description:
Defer the GUI coin control instancing so that argument processing is taken into account for the default coin control values. Fixes #12312
Tree-SHA512: ecda28b94f4709319e9484b01afe763c7c3569097d2afb89db79da8a195c46d20ea77166df7edce0c8ab77627b295def01c072148714503436d27675d5e75d99
Backport of Core PR 12327
https://github.com/bitcoin/bitcoin/pull/12327/files
Completes T556