simplify `::class` usage

framework/grid/GridView.php

@@ -54,7 +54,7 @@ class GridView extends BaseListView
      * @var string the default data column class if the class name is not explicitly specified when configuring a data column.
      * Defaults to 'yii\grid\DataColumn'.
      */
-    public $dataColumnClass;
+    public $dataColumnClass = DataColumn::class;
     /**
      * @var string the caption of the grid table
      * @see captionOptions
@@ -526,7 +526,7 @@ class GridView extends BaseListView
                 $column = $this->createDataColumn($column);
             } else {
                 $column = Yii::createObject(array_merge([
-                    'class' => $this->dataColumnClass ? : DataColumn::class,
+                    'class' => $this->dataColumnClass,
                     'grid' => $this,
                 ], $column));
             }
@@ -551,7 +551,7 @@ class GridView extends BaseListView
         }
 
         return Yii::createObject([
-            'class' => $this->dataColumnClass ? : DataColumn::class,
+            'class' => $this->dataColumnClass,
             'grid' => $this,
             'attribute' => $matches[1],
             'format' => isset($matches[3]) ? $matches[3] : 'text',