Fix breakage caused by TeamMember::permissions removal #1061

Job	Run time
Build docs	1m 30s
Rustfmt	4s
Clippy	44s
Test (MSRV)	13s
Test (stable)	2m 2s
Test (beta)	1m 56s
Test (nightly)	1m 38s
Test (macOS)	3m 11s
Test (Windows)	4m 38s
Test (no features)	1m 5s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 9s
	18m 10s

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