Fix duplicate user bug#21
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Bug Description
Previously, when a user was logged into an interview room in one tab, and tried to join again from another tab, a goroutine would panic when trying to remove one of the users. While this is not a functionality that is necessarily supposed to be allowed, goroutine panics are dangerous for server health. This PR addresses the bug by detecting when a user is already present in the room in another tab, and disallowing joining from a secondary tab.