Remove redundant move in return statement #2770

Job	Run time
pre-commit	48s
build (asio-debugging=on picker-debugging=on)	13m 25s
build (extensions=off logging=off streaming=off super-seeding=off share-mode=off predictive-piece...	14m 10s
build (crypto=gcrypt)	14m 30s
build (mmap-disk-io=off)	13m 38s
check headers	6m 58s
clang-tidy	16m 26s
Fuzzers	15m 17s
Simulations	41m 57s
Tests (address-sanitizer=norecover undefined-sanitizer=norecover crypto=openssl)	24m 20s
Tests (toolset=clang logging=off address-sanitizer=norecover undefined-sanitizer=norecover)	8m 56s
Tests (thread-sanitizer=norecover crypto=openssl release debug-symbols=on)	20m 16s
Tests (crypto=gnutls)	24m 26s
Tests (deprecated-functions=off)	18m 0s
build dist (ubuntu-20.04)	28m 52s
build dist (ubuntu-22.04)	30m 35s
	4h 52m 34s

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