feat(gnokey): -broadcast=true by default

[leohhhn]

Description

Flips the broadcast flag in gnokey to true by default.

cc @moul can we please do this? Makes so much sense: makes using gnokey easier, makes writing docs easier, and is still there if someone wants to explicitly disable it.

For 99% of people this should be on by default.

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/keyscli/maketx.go	0.00%	1 Missing ⚠️

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[thehowl]

I think the UX should likely be -dst <FILE> or -local, so that having the current behaviour is possible through gnokey maketx -dst -.

I agree that this simplifies UX greatly. I'm thinking of security implications, but I think that if someone were to understand that they need to use an offline device to do their transactions, they wouldn't have the key on their online device anyway.

So I support this.