tapchannel: add specifier in property test rfq generator

[GeorgeTsagk]

We include the asset specifier in the generated quotes of the property test framework. This is needed as now the aux invoice HTLC interceptor performs an extra check, according to which the asset ID in the rfq and the wire records must match.

PR #1299 introduced this check

[guggero]

tACK, a couple dozen iterations of make flake-unit pkg=tapchannel didn't fail anymore, whereas on master it would fail within a couple of iterations.

Thanks for the fix!

[coveralls]

Pull Request Test Coverage Report for Build 13032572975

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 25 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+0.009%) to 40.752%

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Files with Coverage Reduction	New Missed Lines	%
tapchannel/aux_leaf_signer.go	3	43.43%
asset/mock.go	7	91.69%
asset/asset.go	7	77.0%
tapgarden/caretaker.go	8	68.49%

Totals
Change from base Build 13022299719:	0.009%
Covered Lines:	26782
Relevant Lines:	65720

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💛 - Coveralls