Fix namespace deprecation warnings

modules/statistics/lib/Ruleset.php

@@ -93,7 +93,7 @@ class Ruleset
 
         $presenterClass = \SimpleSAML\Module::resolveClass(
             $statruleConfig->getValue('presenter', 'statistics:BaseRule'),
-            'Statistics_Rulesets'
+            'Statistics\Rulesets'
         );
         $statrule = new $presenterClass($this->statconfig, $statruleConfig, $rule, $this->available);
         return $statrule;

modules/statistics/lib/StatDataset.php

@@ -244,7 +244,7 @@ class StatDataset
             $fieldpresConfig = $this->ruleconfig->getConfigItem('fieldPresentation');
             $classname = \SimpleSAML\Module::resolveClass(
                 $fieldpresConfig->getValue('class'),
-                'Statistics_FieldPresentation'
+                'Statistics\FieldPresentation'
             );
             if (!class_exists($classname)) {
                 throw new \Exception('Could not find field presentation plugin ['.$classname.']: No class found');