Clean up some stray todos (#11380)

Quick little todo comment cleanups, either because they aren't needed or
a comment will suffice.

Release Notes:

- N/A

crates/collab/src/db/queries/projects.rs

@@ -78,7 +78,6 @@ impl Database {
                 .await?;
 
                 // todo! check user is a project-collaborator
-
                 let room = self.get_room(room_id, &tx).await?;
                 return Ok((project.id, room));
             }