Prevent log output on Windows

[HirotoShioi]

When Daedalus is running on Windows, console GUI shows up while it is running. We should disable it by using silently

Expected: When Daedalus is running, console GUI should not appear
Actual: Console is being displayed while Daedalus is running.

Update:
Using silently does not solve the issue. (TODO): Lookup cabal and stack file of the old launcher code!

[HirotoShioi]

I think I've found the solution
https://stackoverflow.com/questions/51015178/how-to-get-rid-of-the-black-console-window-for-a-compiled-haskell-gui-application

So I need to add this line to cabal file

if os(windows)
    ghc-options: -optl-mwindows