tests: Fix typo in image_tests caught by layer validation updates.

Wrong object type was being used in a destroyObject call.
diff --git a/tests/image_tests.cpp b/tests/image_tests.cpp
index a9ad1be..fd2ccf5 100644
--- a/tests/image_tests.cpp
+++ b/tests/image_tests.cpp
@@ -278,7 +278,7 @@
 
 void VkImageTest::DestroyImageView(VkImageView imageView)
 {
-    ASSERT_VK_SUCCESS(vkDestroyObject(device(), VK_OBJECT_TYPE_IMAGE, imageView));
+    ASSERT_VK_SUCCESS(vkDestroyObject(device(), VK_OBJECT_TYPE_IMAGE_VIEW, imageView));
 }
 
 TEST_F(VkImageTest, CreateImageViewTest) {