Fix SimBrief Controller | flight relationships (#1350)

* Update SimBriefController.php

Fix the fares relationship which was causing trouble when a flight had assigned fares

* Fix model name used in relationship

`Simbrief` should be `SimBrief`

app/Models/Aircraft.php

@@ -134,7 +134,7 @@ class Aircraft extends Model
 
     public function simbriefs()
     {
-        return $this->hasMany(Simbrief::class, 'aircraft_id');
+        return $this->hasMany(SimBrief::class, 'aircraft_id');
     }
 
     public function subfleet()