Fix type specification in DowntimestarthistoryQuery

refs #4190

library/Icinga/Data/Db/TreeToSqlParser.php

@@ -41,7 +41,7 @@ class TreeToSqlParser
     /**
      * The query class to use as the base for converting
      *
-     * @var AbstractQuery
+     * @var BaseQuery
      */
     private $query;
 
@@ -54,7 +54,7 @@ class TreeToSqlParser
     /**
      * Create a new converter from this query
      *
-     * @param AbstractQuery $query      The query to use for conversion
+     * @param   BaseQuery   $query      The query to use for conversion
      */
     public function __construct(BaseQuery $query)
     {

modules/monitoring/library/Monitoring/Backend/Ido/Query/DowntimestarthistoryQuery.php

@@ -10,7 +10,7 @@ class DowntimestarthistoryQuery extends IdoQuery
             'timestamp'     => 'UNIX_TIMESTAMP(actual_start_time)',
             'raw_timestamp' => 'actual_start_time',
             'object_id'     => 'object_id',
-            'type'          => "('dt_end')",
+            'type'          => "('dt_start')",
             'state'         => '(NULL)',
             'state_type'    => '(NULL)',
             'output'        => "('[' || author_name || '] ' || comment_data)",