simpler spacing

src/main/resources/fxml/health_check_list.fxml

@@ -3,14 +3,12 @@
 <?import javafx.geometry.Insets?>
 <?import javafx.scene.control.Button?>
 <?import javafx.scene.control.ButtonBar?>
-<?import javafx.scene.control.CheckBox?>
 <?import javafx.scene.control.Label?>
 <?import javafx.scene.control.ListView?>
 <?import javafx.scene.layout.HBox?>
 <?import javafx.scene.layout.StackPane?>
 <?import javafx.scene.layout.VBox?>
 <?import java.lang.Integer?>
-<?import javafx.scene.layout.Region?>
 <VBox xmlns:fx="http://javafx.com/fxml"
 	  xmlns="http://javafx.com/javafx"
 	  fx:controller="org.cryptomator.ui.health.CheckListController"
@@ -28,9 +26,8 @@
 			<ListView fx:id="checksListView" VBox.vgrow="ALWAYS" minWidth="175" maxWidth="175"/>
 			<VBox alignment="CENTER" visible="${!controller.mainRunStarted}"  managed="${!controller.mainRunStarted}" HBox.hgrow="ALWAYS" spacing="12">
 				<Label text="%health.checkList.description" wrapText="true"/>
-				<HBox alignment="CENTER">
+				<HBox alignment="CENTER" spacing="6">
 					<Button onAction="#selectAllChecks" text="%health.checkList.selectAllButton" />
-					<Region prefWidth="6"/>
 					<Button onAction="#deselectAllChecks" text="%health.checkList.deselectAllButton" />
 				</HBox>
 			</VBox>