do not sort sequence and region on add

src/scene-round-trip.cpp

@@ -100,8 +100,6 @@ void SceneSwitcher::on_sceneRoundTripAdd_clicked()
 				}
 			}
 		}
-
-		ui->sceneRoundTrips->sortItems();
 	}
 }
 

src/screen-region-switch.cpp

@@ -86,8 +86,6 @@ void SceneSwitcher::on_screenRegionAdd_clicked()
 				}
 			}
 		}
-
-		ui->screenRegions->sortItems();
 	}
 }