refactor: simplify From<ureq::Error> #976

Job	Run time
Clippy stable	53s
rustfmt	3s
Features stable ubuntu-latest	4m 35s
Clippy beta	1m 14s
Release x86_64-unknown-linux-gnu	1m 17s
Features stable macos-latest	4m 3s
Release aarch64-unknown-linux-gnu	1m 26s
Test stable ubuntu-latest	1m 48s
Clippy nightly	1m 15s
Features stable windows-latest	8m 37s
Release armv7-unknown-linux-gnueabihf	1m 21s
Test stable macos-latest	1m 30s
Test stable windows-latest	3m 21s
Features beta ubuntu-latest	4m 56s
Release arm-unknown-linux-gnueabihf	1m 21s
Test beta ubuntu-latest	1m 52s
Features beta macos-latest	4m 8s
Release riscv64gc-unknown-linux-gnu	1m 19s
Test beta macos-latest	1m 33s
Features beta windows-latest	8m 25s
Release x86_64-apple-darwin	1m 2s
Test beta windows-latest	3m 26s
Release aarch64-apple-darwin	1m 1s
Test nightly ubuntu-latest	1m 30s
Release x86_64-pc-windows-msvc	2m 47s
Test nightly macos-latest	1m 31s
Release aarch64-pc-windows-msvc	2m 36s
Test nightly windows-latest	3m 19s
	1h 12m 9s

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