chore(pfm): remove unused `refundTimeout` #108

Job	Run time
Linter	3m 44s
test	2m 8s
build-docker	2m 25s
e2e-tests (ictest-forward)	7m 34s
e2e-tests (ictest-timeout)	5m 29s
e2e-tests (ictest-upgrade)	3m 35s
e2e-tests (ictest-nonrefundable)	8m 43s
	33m 38s

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