Apply fixes from StyleCI

Author: yajra

src/Services/DataTable.php

@@ -405,7 +405,7 @@ public function excel()
      */
     protected function buildExcelFile()
     {
-        if ($this->exportClass <> DataTablesExportHandler::class) {
+        if ($this->exportClass != DataTablesExportHandler::class) {
             $collection = collect($this->getAjaxResponseData());
         } else {
             $collection = collect($this->getDataForExport());

src/Services/DataTablesExportHandler.php

@@ -6,5 +6,4 @@
 
 class DataTablesExportHandler extends DataTablesCollectionExport
 {
-
 }