Perform inline choice conversion to string in macro #1196

Job	Run time
Rustfmt	9s
Clippy	1m 13s
Build docs	1m 30s
Test (MSRV)	1m 27s
Test (stable)	2m 20s
Test (beta)	2m 3s
Test (nightly)	2m 3s
Test (macOS)	1m 48s
Test (Windows)	5m 16s
Test (no features)	1m 11s
Test (all features - simdjson, cargo test --all-features --lib --tests --examples)	1m 29s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 25s
	21m 54s

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