Fix radius reset when editing FW Landing Patterns

Resolved an issue where the loiter radius of a fixed-wing Landing
Pattern would revert back to its default value when starting to edit the
mission item.

Author: rubenp02

src/PlanView/FWLandingPatternEditor.qml

@@ -41,7 +41,7 @@ Rectangle {
     property string _setToVehicleLocationStr:   qsTr("Set to vehicle location")
     property bool   _showCameraSection:         !_missionVehicle.apmFirmware
     property int    _altitudeMode:              missionItem.altitudesAreRelative ? QGroundControl.AltitudeModeRelative : QGroundControl.AltitudeModeAbsolute
-    property real   _previousLoiterRadius:      0
+    property real   _previousLoiterRadius:      missionItem.loiterRadius.rawValue
 
     Column {
         id:                 editorColumn
@@ -74,12 +74,8 @@ Rectangle {
                 // glide slope heading correctly
                 onCheckedChanged: {
                     if (checked) {
-                        // Restore the previous loiter radius or set the default value
-                        if (_previousLoiterRadius > 0) {
-                            missionItem.loiterRadius.rawValue = _previousLoiterRadius
-                        } else {
-                            missionItem.loiterRadius.rawValue = missionItem.loiterRadius.defaultValue
-                        }
+                        // Restore the previous loiter radius
+                        missionItem.loiterRadius.rawValue = _previousLoiterRadius
                     } else {
                         _previousLoiterRadius = missionItem.loiterRadius.rawValue
                         missionItem.loiterRadius.rawValue = 0