unified spacing

src/main/resources/fxml/vault_detail_missing.fxml

@@ -9,7 +9,7 @@
 	  xmlns="http://javafx.com/javafx"
 	  fx:controller="org.cryptomator.ui.mainwindow.VaultDetailMissingVaultController"
 	  alignment="TOP_CENTER"
-	  spacing="24">
+	  spacing="9">
 	<children>
 		<VBox spacing="9" alignment="CENTER">
 			<StackPane alignment="CENTER">

src/main/resources/fxml/vault_detail_welcome.fxml

@@ -8,7 +8,7 @@
 	  xmlns="http://javafx.com/javafx"
 	  fx:controller="org.cryptomator.ui.mainwindow.WelcomeController"
 	  alignment="CENTER"
-	  spacing="24">
+	  spacing="9">
 	<children>
 		<ImageView VBox.vgrow="ALWAYS" fitHeight="128" preserveRatio="true" smooth="true" cache="true">
 			<Image url="@../img/logo.png"/>