[[IE]] Default Values are not shown for Horizontal Alignment and Vertical Alignment combo boxes on Cell Properties dialog

[Satya Minnekanti]

To Reproduce the defect:
1) Open the ajax sample
2) Insert a Table
3) Activate the Table Context menu and open Cell properties dialog
4) Check for the default Values in Horizontal Alignment and Vertical Alignment Combo boxes

They are not set,where as in FF default value of <not set> will be shown in both Combo boxes

Reproduced in IE6 and IE7

[Frederico Caldeira Knabben]

Considering that this one is a regression, and the fix is quite small and low risk, I've fixed it directly with [5177] for the 3.2.