paraview: remove Qt5 from the package name

Fixes #78

projects/paraview.suffix.cmake

 # Set suffix to be used for generating archives. This ensures that the package
 # files have decent names that we can directly upload to the website.
 set(package_suffix_items)
-if (qt5_enabled)
-  list(APPEND package_suffix_items
-    Qt5)
-endif ()
 if (mpi_enabled)
   list(APPEND package_suffix_items
     MPI)