Update `rustfmt` config #1146

Job	Run time
set-image	1s
clippy	23m 11s
clippy-examples (STD)	22m 17s
check (STD)	16m 25s
clippy-examples (WASM)	13m 39s
dylint	14m 4s
check (WASM)	11m 10s
fmt	11m 21s
check (RISCV)	11m 39s
spellcheck	9m 57s
test (ink)	19m 47s
test (linting)	13m 35s
build (STD)	18m 46s
build (WASM)	10m 55s
codecov	22m 38s
examples-custom-test	25m 28s
docs	18m 19s
examples-test (1)	9m 23s
examples-test (2)	14m 20s
examples-test (3)	8m 59s
examples-test (4)	14m 10s
examples-test (5)	10m 54s
examples-test (6)	9m 10s
examples-docs	14m 25s
examples-contract-build (WASM, 1)	17m 18s
examples-contract-build (WASM, 2)	18m 30s
examples-contract-build (WASM, 3)	18m 38s
examples-contract-build (WASM, 4)	16m 45s
examples-contract-build (RISCV, 1)	12m 50s
fuzz	0s
measurements / contract-sizes (master)	31m 3s
measurements / contract-sizes (pull_request)	30m 26s
	8h 10m 3s

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