replaced getparam by getvar on retrieving default group

Author: feltra

manifests/pip.pp

@@ -54,7 +54,7 @@
   Enum['pip', 'pip3'] $pip_provider                          = 'pip',
   Variant[Boolean, String] $url                              = false,
   String[1] $owner                                           = 'root',
-  $group                                                     = getparam(Class['python'], 'group'),
+  $group                                                     = getvar('python::params::group'),
   $umask                                                     = undef,
   $index                                                     = false,
   Variant[Boolean, String] $proxy                            = false,