tests: Fix incorrect descriptor type

SamplerInUseDestroyedSignaled test was incorrectly using VK_DESCRIPTOR_TYPE_SAMPLER
instead of VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER
diff --git a/tests/layer_validation_tests.cpp b/tests/layer_validation_tests.cpp
index 2b41c7f..bdf2e7c 100644
--- a/tests/layer_validation_tests.cpp
+++ b/tests/layer_validation_tests.cpp
@@ -12935,7 +12935,7 @@
 
     VkDescriptorSetLayoutBinding layout_binding;
     layout_binding.binding = 0;
-    layout_binding.descriptorType = VK_DESCRIPTOR_TYPE_SAMPLER;
+    layout_binding.descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
     layout_binding.descriptorCount = 1;
     layout_binding.stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT;
     layout_binding.pImmutableSamplers = NULL;