rhbz#980387 fix filter selection from file ext.
rhbz#980387 fix filter selection from file ext.

... for filters that have more than one extension associated with them
(e.g., JPEG).

Change-Id: Ic6b16d3b4aa17580404d02a9fb7b087b9aa52fc2

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