make date column resizable

this makes the date column in the snapshottree a little bit bigger and
resizable

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

www/manager6/qemu/SnapshotTree.js

@@ -275,8 +275,7 @@ Ext.define('PVE.qemu.SnapshotTree', {
 		{
 		    text: gettext('Date') + "/" + gettext("Status"),
 		    dataIndex: 'snaptime',
-		    resizable: false,
-		    width: 120,
+		    width: 150,
 		    renderer: function(value, metaData, record) {
 			if (record.data.snapstate) {
 			    return record.data.snapstate;