Remove `duct` from `talpid-tunnel` #1366

Job	Run time
build-ios (aarch64-apple-ios)	2m 34s
build-ios (aarch64-apple-ios-sim)	4m 52s
clippy-check-ios (aarch64-apple-ios)	1m 26s
clippy-check-ios (aarch64-apple-ios-sim)	1m 14s
	10m 6s

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