Issue #3420705 by mably: Add a view field alias to allow sorting process views by completion time

Closes #3420705

src/Plugin/views/field/MaestroEngineProcessCompletionTime.php

@@ -20,6 +20,8 @@ class MaestroEngineProcessCompletionTime extends FieldPluginBase {
    */
   public function query() {
     // No Query to be done.
+    // Add an alias to allow sorting process views by completion time.
+    $this->field_alias = $this->realField;
   }
 
   /**