cli: rename --amount to --amt in static

[starius]

loop static in --amt
loop static withdraw --amt

This is done to make it consistent with other commands and products.

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[hieblmi]

To remain compatible to current automation scripts should we just add the amt flag rather than replacing the amount flag with it?

[starius]

@hieblmi I think we can just rename it, because the --amount flag is broken in release 0.31.4 and 0.31.5 is not released yet, so it is unlikely that somebody already uses it in automation scripts.

[bhandras]

LGTM 🎉

[bhandras]

Actually github.com/urfave/cli/v2 does support flag aliases, ie you can do something like this:

&cli.IntFlag{
  Name:        "amount",
  Aliases:     []string{"amt"},
}

[starius]

I added --amount as an alias.

[hieblmi]

Thank you. LGTM.