reverted change which made the progress dialog more realistic but also made the code...

reverted change which made the progress dialog more realistic but also made the code vastly more complex (rev 1.116), it's not really needed otherwise than to test the patch it was bundled with; simplified the test code for wxPD_SKIP (rev 1.119); increased the progress counter to see the indeterminate mode marker wrap around

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42255 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775