Re-Fix BugTrac #850: _ExcelReadSheetToArray()

[PsaltyDS]

The bug described and fixed in Track #850, was previously reported and fixed in the original ExcelCOM_UDF topic: ​http://www.autoitscript.com/forum/index.php?s=&showtopic=34302&view=findpost&p=491640

The original fix was:

    ; Extract integer last row and col
    Local $avLastCell = StringRegExp($sLastCell, "\d+", 3)
    Local $iLastRow = Number($avLastCell[0])
    Local $iLastColumn = Number($avLastCell[1])

The proposed fix arrived at in #850 uses:

    ; Extract integer last row and col
    $sLastCell = StringRegExp($sLastCell,"\A[^0-9]*(\d+)[^0-9]*(\d+)\Z",3)
    Local $iLastRow = $sLastCell[0]
    Local $iLastColumn = $sLastCell[1]

The original fix is simpler, and doesn't mis-name the the array variable with '$s' prefix.

I propose the original fix apply vice the new one in #850.

Also, regardless of which fix is applied, that we get some more non-English testers before finally closing the ticket.