Bug#848665: xrdp: Incorrect package version (0.9.1 instead of 0.9.0)

[Dominik George]

Control: tags -1 + wontfix

> It was bumped to 0.9.1, but there was no release and configure.ac still 
> contains 0.9.0.

There wasn't a 0.9.0 release either.

The next release will be 0.9.1 and 0.9.1~ is a preview of that version, hence 
the ~.