Clear image layer 0 in memory commitment test

Components: Vulkan
Affected:   dEQP-VK.api.get_memory_commitment.memory_commitment
VK-GL-CTS issue: 1151

Change-Id: I95676f18f91470248ac19270778b897626a31f2c
diff --git a/external/vulkancts/modules/vulkan/api/vktApiGetMemoryCommitment.cpp b/external/vulkancts/modules/vulkan/api/vktApiGetMemoryCommitment.cpp
index 7dd59a9..cfedca0 100644
--- a/external/vulkancts/modules/vulkan/api/vktApiGetMemoryCommitment.cpp
+++ b/external/vulkancts/modules/vulkan/api/vktApiGetMemoryCommitment.cpp
@@ -488,7 +488,7 @@
 	const VkClearRect clearRect =
 	{
 		rect,
-		1u, // baseArrayLayer
+		0u, // baseArrayLayer
 		1u	// layerCount
 	};