fdo#60625 - Document converter wizard fails to find powerpoint files to convert
fdo#60625 - Document converter wizard fails to find powerpoint files to convert

Previously all the formats was specified but none of them were being converted or detected .  But in my patch , it is able to detect and convert ppt pptm pptx formats .

So ,we can atleast add support for these formats .

Change-Id: I6083a9048ada870178753cd4ba523c9d3916cf11
Reviewed-on: https://gerrit.libreoffice.org/3617
Reviewed-by: Tor Lillqvist <a9ff1a38c0d094d92725714af3aa7948469a0905@iki.fi>
Tested-by: Tor Lillqvist <a9ff1a38c0d094d92725714af3aa7948469a0905@iki.fi>

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