Fix persistent wallet on log out

This patch simply disconects the wallet connection when a user logs out.

Changelog-Fixed: Fixed wallet not disconnecting when a user logs out

Signed-off-by: ericholguin <ericholguin@apache.org>
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Models/DamusState.swift

@@ -99,6 +99,7 @@ class DamusState: HeadlessDamusState {
 
     func close() {
         print("txn: damus close")
+        wallet.disconnect()
         pool.close()
         ndb.close()
     }