Fix category change signalling.

src/QmlControls/ParameterEditorController.cc

@@ -48,6 +48,7 @@ ParameterEditorController::ParameterEditorController(void)
     _updateParameters();
 
     connect(this, &ParameterEditorController::searchTextChanged,        this, &ParameterEditorController::_updateParameters);
+    connect(this, &ParameterEditorController::currentCategoryChanged,   this, &ParameterEditorController::_updateParameters);
     connect(this, &ParameterEditorController::currentGroupChanged,      this, &ParameterEditorController::_updateParameters);
 }