fix a typo

AircraftReport.proto

@@ -9,6 +9,6 @@ message AircraftReport {
     string     initialApproachFix = 2; // last waypoint of the route
     Coordinate position           = 3; // current WGS84 position
     Dynamics   dynamics           = 4; // current aircraft dynamics
-    string     destination;       = 5; // the destination airport
+    string     destination        = 5; // the destination airport
     Time       timeAtIAF          = 6; // UTC time when aircraft is at IAF
 }