chore(txsim): removes deprecated `-r` flag from txsim docker README #3947

Job	Run time
goreleaser / goreleaser-check	10s
lint / golangci-lint	26s
lint / yamllint	6s
markdown-linter / markdown-link-check	1m 41s
markdown-linter / markdown-lint	7s
test / test	8m 31s
test / test-coverage	2m 3s
test / test-fuzz	4m 59s
test / test-race	4m 4s
test / test-short	1m 1s
lint / hadolint / hadolint	10s
goreleaser / goreleaser	0s
	23m 18s

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