Replace bans delete_message_days with delete_message_seconds #5817

Job	Run time
Test (nightly)	1m 48s
Test (stable)	2m 41s
Build docs	45s
Test (beta)	2m 55s
Test (macOS)	1m 38s
Test (Windows)	4m 49s
Check minimal versions	32s
Test (native-tls)	2m 22s
MSRV	0s
Test (no default features)	56s
Test (no cache)	2m 16s
Test (no gateway)	1m 55s
Test (unstable Discord API features)	3m 4s
Test (chrono, chrono)	1m 9s
Test (unstable API + typesize, default unstable typesize, true)	59s
Test (builder without model, builder, true)	49s
Test (unstable Discord API (no default features), unstable, true)	31s
Examples	2m 29s
	31m 38s

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