abort_download() is OK in any state #3269

Job	Run time
build (asio-debugging=on picker-debugging=on)	30m 8s
build (extensions=off logging=off streaming=off super-seeding=off share-mode=off predictive-piece...	22m 56s
check headers	4m 4s
build (crypto=gcrypt)	26m 23s
build (mmap-disk-io=off)	28m 29s
clang-tidy	9m 58s
Fuzzers	8m 32s
build dist (ubuntu-20.04)	17m 5s
pre-commit	44s
build dist (ubuntu-22.04)	16m 14s
Simulations	19m 11s
Tests (address-sanitizer=norecover undefined-sanitizer=norecover crypto=openssl)	16m 39s
Tests (toolset=clang logging=off address-sanitizer=norecover undefined-sanitizer=norecover)	11m 17s
Tests (thread-sanitizer=norecover crypto=openssl release debug-symbols=on cxxflags=-Wno-tsan)	17m 58s
Tests (crypto=gnutls)	11m 58s
Tests (deprecated-functions=off)	11m 16s
	4h 12m 52s

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