Ensure consistency in case of component reuse

src/components/FirstActivator.vue

@@ -24,6 +24,8 @@ export default {
         .then(activator => {
           if (this.homeCallsign(this.callsign) !== this.homeCallsign(activator.callsign)) {
             this.databaseCallsign = this.homeCallsign(activator.callsign)
+          } else {
+            this.databaseCallsign = null
           }
         })
     }