fix unit test

Author: mrtuvn

app/code/Magento/Customer/Test/Unit/Model/EmailNotificationTest.php

@@ -347,7 +347,7 @@ public function testPasswordReminder(): void
         $customer = $this->createMock(CustomerInterface::class);
         $customer->expects($this->any())
             ->method('getWebsiteId')
-            ->willReturn($self::STUB_CUSTOMER_WEBSITE_ID);
+            ->willReturn(self::STUB_CUSTOMER_WEBSITE_ID);
         $customer->expects($this->any())
             ->method('getStoreId')
             ->willReturn(self::STUB_CUSTOMER_STORE_ID);