Fix display of param load errors

src/QmlControls/ParameterEditor.qml

@@ -32,10 +32,8 @@ Item {
     property var    _appSettings:       QGroundControl.settingsManager.appSettings
 
     ParameterEditorController {
-        id:         controller;
-        onShowErrorMessage: {
-            mainWindow.showMessageDialog(qsTr("Parameter Editor"), qsTr("Parameter Load Errors"))
-        }
+        id:                 controller
+        onShowErrorMessage: mainWindow.showMessageDialog(qsTr("Parameter Load Errors"), errorMsg)
     }
 
     ExclusiveGroup { id: sectionGroup }