litcli: drop unused flags from addinvoice command #3389

Job	Run time
frontend tests on windows-latest	5m 11s
build itest binaries	1m 40s
backend build on ubuntu-latest	14m 30s
cross compilation (i386, linux-386)	6m 57s
backend build on windows-latest	17m 15s
run unit tests (unit)	5m 59s
cross compilation (arm, darwin-arm64 linux-armv6 linux-armv7 linux-arm64)	22m 59s
frontend tests on macOS-latest	2m 49s
run unit tests (unit dbbackend=sqlite)	6m 56s
cross compilation (amd64, darwin-amd64 linux-amd64 windows-amd64)	17m 37s
backend build on macOS-latest	9m 2s
run unit tests (unit dbbackend=postgres)	8m 11s
RPC proto compilation check	4m 2s
run unit tests (unit-race)	9m 10s
Sqlc check	38s
check release notes updated	6s
frontend tests on ubuntu-latest	2m 40s
lint	7m 49s
check commits	5m 45s
integration test (sqlite, itest-parallel icase=terminal dbbackend=sqlite tranches=4)	9m 57s
integration test (postgres, itest-parallel icase=terminal dbbackend=postgres tranches=4)	10m 30s
integration test (bbolt, itest-parallel icase=terminal dbbackend=bbolt tranches=4)	7m 0s
	2h 56m 43s

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