Fix name of Debian dependency

packaging/debian/control

  shellfu (<< 0.11),
  shellfu-bash,
  shellfu-bash-pretty,
- libxml2-python,
+ python-libxml2,
 
 Package: __MKIT_PROJ_PKGNAME__
 Architecture: all
  shellfu (<< 0.11),
  shellfu-bash,
  shellfu-bash-pretty,
- libxml2-python,
+ python-libxml2,
 Description: __MKIT_PROJ_NAME__ - __MKIT_PROJ_TAGLINE__
  pxpath is Shellfu/Bash wrapper around libxml2-python with intent
  to enable you to make simple XPath queries from a shell script,