Replace sprout-homebrew with banno-sprout-homebrew in soloistrc

https://trello.com/c/W3Ya0mkp/32-banno-sprout-homebrew-unwind-sprout-homebrew-execute-based-installation
Merge pull request #1 from Banno/idempotency-fix-sprout-homebrew_cask

Replace sprout-homebrew with banno-sprout-homebrew in soloistrc