ui: tape/BackupOverview: add generic 'Restore' button

this will open the restore window without anything preselected

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

www/tape/BackupOverview.js

@@ -17,6 +17,12 @@ Ext.define('PBS.TapeManagement.BackupOverview', {
 	    });
 	},
 
+	restore: function() {
+	    Ext.create('PBS.TapeManagement.TapeRestoreWindow', {
+		autoShow: true,
+	    });
+	},
+
 	restoreBackups: function(view, rI, cI, item, e, rec) {
 	    let me = this;
 
@@ -255,6 +261,10 @@ Ext.define('PBS.TapeManagement.BackupOverview', {
 	    text: gettext('New Backup'),
 	    handler: 'backup',
 	},
+	{
+	    text: gettext('Restore'),
+	    handler: 'restore',
+	},
     ],
 
     columns: [