`--ensure-directory` doesn't extract `.rpm` archive if `pwd` contains a space

[Alexander Kurakin]

$ xarchiver --version
xarchiver 0.5.4.20 

Let's we have a space in current path:

$ pwd
/home/user/Рабочий стол

And an .rpm file:

$ xarchiver --ensure-directory file.rpm

Similar to #94 ?

/cc @ib

[Ingo Brückl]

Fixed.