datastore content: reduce count column width

Using 75 as width we can display up to 9999999 which would allow
displaying over 19 years of snapshots done each minute, so quite
enough for the common cases.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

www/DataStoreContent.js

@@ -545,6 +545,8 @@ Ext.define('PBS.DataStoreContent', {
 	    format: '0',
 	    header: gettext("Count"),
 	    sortable: true,
+	    width: 75,
+	    align: 'right',
 	    dataIndex: 'count',
 	},
 	{