MAPG-142 remove unnecessary 'now' from DateTime constructor

src/PersistentData/Model/Place.php

@@ -166,7 +166,7 @@ class Place extends Model
         }
 
         $this->panoIdCached = $panoId;
-        $this->panoIdCachedTimestamp = new DateTime('now');
+        $this->panoIdCachedTimestamp = new DateTime();
 
         (new PersistentDataManager())->saveToDb($this);