Remove the Excel 4.0/95/97 detection bits from ScFilterDetect.
Remove the Excel 4.0/95/97 detection bits from ScFilterDetect.

We still need to leave the MS Excel 4.0 filter name there as it's
used for Excel 1.0/2.0/3.0 file formats.  In the future we might move
these to ScExcelBiffDetect as well...

Change-Id: I8422e7470fbb0a14c219b7f67e3dfd4a34131eba

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core