ui: tape: add TapeInventory panel

since we do not show the tapes anymore in the BackupOverview, add
another panel where we can list the available tapes in the inventory

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

www/tape/TapeManagement.js

@@ -16,6 +16,11 @@ Ext.define('PBS.TapeManagement', {
 	    itemId: 'backup',
 	    xtype: 'pbsBackupOverview',
 	},
+	{
+	    title: gettext('Tape Inventory'),
+	    itemId: 'inventory',
+	    xtype: 'pbsTapeInventory',
+	},
 	{
 	    title: gettext('Library'),
 	    itemId: 'library',