place default case last in selectors

According to the selector documentation (https://docs.puppetlabs.com/puppet/latest/reference/lang_conditional.html#selectors), the default case should be last:

"Cases are compared in the order that they are written in the manifest; thus, the default case (if any) must be at the end of the list."

This is fixed in 3.7+ but would be nice to fix in this module for people using < 3.7

See also https://tickets.puppetlabs.com/browse/PUP-2642

manifests/init.pp

@@ -58,28 +58,28 @@ class java(
   }
 
   $use_java_package_name = $package ? {
-    default => $package,
     undef   => $default_package_name,
+    default => $package,
   }
 
   ## If $java_alternative is set, use that.
   ## Elsif the DEFAULT package is being used, then use $default_alternative.
   ## Else undef
   $use_java_alternative = $java_alternative ? {
-    default => $java_alternative,
     undef   => $use_java_package_name ? {
       $default_package_name => $default_alternative,
       default               => undef,
-    }
+    },
+    default => $java_alternative,
   }
 
   ## Same logic as $java_alternative above.
   $use_java_alternative_path = $java_alternative_path ? {
-    default => $java_alternative_path,
     undef   => $use_java_package_name ? {
       $default_package_name => $default_alternative_path,
       default               => undef,
-    }
+    },
+    default => $java_alternative_path,
   }
 
   anchor { 'java::begin:': }