Fix device cleanup

Summary: Found some code duplication causing old devices not entirely to be cleaned up as they should

Reviewed By: nikoant

Differential Revision: D26422665

fbshipit-source-id: f57757f7260ac5de17edd80e9f66cc844d1a6213

desktop/app/src/reducers/connections.tsx

@@ -218,7 +218,7 @@ export default (state: State = INITAL_STATE, action: Actions): State => {
             if (!deviceSerials.has(device.serial)) {
               return true;
             } else {
-              device.teardown();
+              device.destroy();
               return false;
             }
           });