Use Formatter::pad (instead of write_str) for Weekdays #3491

Job	Run time
check-docs	22s
cross-tests (ubuntu-latest)	1m 42s
cross-targets (x86_64-unknown-illumos)	1m 5s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	9s
features_check (ubuntu-latest)	3m 53s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	11s
no_std (ubuntu-latest, thumbv6m-none-eabi)	14s
rust_msrv (ubuntu-latest)	55s
alternative_targets (ubuntu-latest, aarch64-linux-android)	13s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	12s
rust_versions (ubuntu-latest, stable)	1m 0s
test_wasi (ubuntu-latest, wasm32-wasi)	16s
rust_versions (ubuntu-latest, beta)	1m 15s
test_wasm (ubuntu-latest)	20s
rust_versions (ubuntu-latest, nightly)	1m 5s
timezones (ubuntu-latest, ACST-9:30)	1m 24s
timezones (ubuntu-latest, EST4)	1m 20s
timezones (ubuntu-latest, UTC0)	1m 16s
timezones (ubuntu-latest, Asia/Katmandu)	1m 24s
timezones (macos-latest, ACST-9:30)	30s
timezones (macos-latest, EST4)	48s
timezones (macos-latest, UTC0)	50s
timezones (macos-latest, Asia/Katmandu)	44s
timezones (windows-latest, ACST-9:30)	1m 45s
timezones (windows-latest, EST4)	2m 36s
timezones (windows-latest, UTC0)	1m 17s
timezones (windows-latest, Asia/Katmandu)	2m 28s
	29m 14s

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