remove (pointless?) scope(failure) assert(false)
remove (pointless?) scope(failure) assert(false)

- hides any real backtrace
- test seem flaky (at least failed once on ci.dlang.org, see #2054)
gedaiu/vibe.d,Geod24/vibe.d,chalucha/vibe.d,rejectedsoftware/vibe.d,etcimon/vibe.d,etcimon/vibe.d