Fix password prompt on Windows

[pmatseykanets]

GOOS=windows go build ./cmd/gh-find
# github.com/pmatseykanets/gh-tools/terminal
terminal/terminal.go:17:33: cannot use syscall.Stdin (type syscall.Handle) as type int in argument to terminal.GetState
terminal/terminal.go:30:24: cannot use syscall.Stdin (type syscall.Handle) as type int in argument to terminal.Restore
terminal/terminal.go:44:40: cannot use syscall.Stdin (type syscall.Handle) as type int in argument to terminal.ReadPassword

The syscall.Stdin has to be converted to int.

https://pkg.go.dev/syscall?GOOS=windows#pkg-variables

var (
	Stdin  = getStdHandle(STD_INPUT_HANDLE)
	Stdout = getStdHandle(STD_OUTPUT_HANDLE)
	Stderr = getStdHandle(STD_ERROR_HANDLE)
)

func getStdHandle(h int) (fd Handle) {...}

vs

https://pkg.go.dev/syscall?GOOS=linux#pkg-variables

var (
	Stdin  = 0
	Stdout = 1
	Stderr = 2
)

[codecov]

Codecov Report

Merging #24 (a3f6661) into master (8552a8f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #24   +/-   ##
=======================================
  Coverage   12.06%   12.06%           
=======================================
  Files           6        6           
  Lines         895      895           
=======================================
  Hits          108      108           
  Misses        783      783           
  Partials        4        4           

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