refactor: simplify From<ureq::Error> #972

Job	Run time
Clippy stable	59s
rustfmt	10s
Clippy beta	54s
Test stable ubuntu-latest	1m 16s
Features stable ubuntu-latest	4m 46s
Clippy nightly	44s
Test stable macos-latest	1m 0s
Features stable macos-latest	4m 45s
Test stable windows-latest	2m 43s
Release x86_64-unknown-linux-gnu	1m 19s
Features stable windows-latest	8m 35s
Test beta ubuntu-latest	1m 9s
Release aarch64-unknown-linux-gnu	47s
Features beta ubuntu-latest	4m 48s
Release armv7-unknown-linux-gnueabihf	1m 0s
Test beta macos-latest	1m 13s
Features beta macos-latest	5m 9s
Release arm-unknown-linux-gnueabihf	54s
Features beta windows-latest	10m 11s
Test beta windows-latest	2m 41s
Release riscv64gc-unknown-linux-gnu	47s
Test nightly ubuntu-latest	53s
Release x86_64-apple-darwin	30s
Test nightly macos-latest	1m 14s
Release aarch64-apple-darwin	33s
Test nightly windows-latest	2m 6s
Release x86_64-pc-windows-msvc	2m 16s
Release aarch64-pc-windows-msvc	1m 12s
	1h 4m 34s

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