Fix #12179.

In WebKit browsers, when a schema is saved, existing column
field types are reset to "Text". This is not a bug in WebKit, and
will happen in any browser that implements Option() as documented.

Option() is not supposed to have an immediate action if only the
default selection is updated on a newly added select object.
See: http://download.oracle.com/docs/cd/E19957-01/816-6408-10/option.htm .

Repeat-By:
1. New Content->basic->Datatable
2. data
3. Edit Schema
4. col1, Number, Add Column
5. col2, E-mail, Add Column
6. col3, URL, Add Column
7. Edit Schema (note that the field types got reset to "Text")
8  Save (now the field types incorrectly got overwritten in the DataTable)

Fixed by adding 4th arguments to actually make the new selection to be
equal to the default one.

www/extras/yui-webgui/build/form/datatable.js

@@ -459,10 +459,12 @@ WebGUI.Form.DataTable
             format.name             = "format_" + i;
 
             for ( var x = 0; x < availableFormats.length; x++ ) {
+                var selected = cols[i].formatter == availableFormats[x].value;
                 var opt = new Option(
                     availableFormats[x].label, 
                     availableFormats[x].value,
-                    cols[i].formatter == availableFormats[x].value
+                    selected,
+                    selected
                 );
                 format.appendChild( opt );
             }