fixed some SonarCloud mentioned issues

src/main/java/org/cryptomator/ui/mainwindow/MainWindowModule.java

@@ -15,7 +15,6 @@ import org.cryptomator.ui.common.FxmlScene;
 import org.cryptomator.ui.common.StageFactory;
 import org.cryptomator.ui.common.StageInitializer;
 import org.cryptomator.ui.fxapp.PrimaryStage;
-import org.cryptomator.ui.health.HealthCheckComponent;
 import org.cryptomator.ui.migration.MigrationComponent;
 import org.cryptomator.ui.removevault.RemoveVaultComponent;
 import org.cryptomator.ui.stats.VaultStatisticsComponent;
@@ -28,7 +27,6 @@ import javafx.beans.property.SimpleObjectProperty;
 import javafx.scene.Scene;
 import javafx.stage.Modality;
 import javafx.stage.Stage;
-import javafx.stage.StageStyle;
 import java.util.Map;
 import java.util.ResourceBundle;
 

src/main/java/org/cryptomator/ui/mainwindow/VaultListController.java

@@ -124,9 +124,7 @@ public class VaultListController implements FxController {
 			}
 		});
 
-		vaults.addListener((ListChangeListener<Vault>) c -> {
-			vaultList.prefHeightProperty().bind(vaultList.fixedCellSizeProperty().multiply(vaultList.getItems().size()));
-			});
+		vaults.addListener((ListChangeListener<Vault>) _ -> vaultList.prefHeightProperty().bind(vaultList.fixedCellSizeProperty().multiply(vaultList.getItems().size())));
 
 		selectedVault.bind(vaultList.getSelectionModel().selectedItemProperty());
 		vaults.addListener((ListChangeListener.Change<? extends Vault> c) -> {