Update thread.rs

Author: NateDiamond13

src/model/channel/thread.rs

@@ -33,6 +33,8 @@ impl ThreadId {
         guild_id: Option<GuildId>,
     ) -> Result<GuildThread> {
         #[cfg(feature = "cache")]
+        // Ignore clippy, the two `if let`s must be separated
+        #[allow(clippy::collapsible_if)]
         if let Some(cache) = cache_http.cache() {
             if let Some(guild_id) = guild_id
                 && let Some(guild) = cache.guild(guild_id)