flightdash: put switch case with local var in a codeblocK

apps/flightdash/flightdash.settings.js

@@ -60,6 +60,7 @@
         loadNearest(fix.lat, fix.lon);
         break;
       case 'createUserWaypoint':
+        {
           if (!('userWaypoints' in settings))
             settings.userWaypoints = [];
           let newIdx = settings.userWaypoints.length;
@@ -71,6 +72,7 @@
           writeSettings();
           showUserWaypoints();
           break;
+        }
       case 'destAVWX':
         // the free ("hobby") account of AVWX is limited to 10 nearest stations
         avwx.request('station/near/'+fix.lat+','+fix.lon, 'n=10&airport=true&reporting=false', data => {