Remove duplicate channels map (#2602) #731

Job	Run time
Test (nightly)	2m 42s
Test (macOS)	3m 13s
MSRV	0s
Examples	3m 0s
Build docs	25s
Test (stable)	3m 1s
Check minimal versions	31s
Test (beta)	2m 35s
Test (Windows)	3m 33s
Test (native-tls)	2m 52s
Test (no default features)	45s
Test (no cache)	3m 0s
Test (no gateway)	1m 50s
Test (unstable Discord API features)	1m 4s
Test (simd-json)	3m 3s
Test (chrono, chrono)	42s
Test (builder without model, builder, true)	25s
Test (unstable Discord API (no default features), unstable_discord_api, true)	23s
	33m 4s

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