tests: Modify vkMapMemory calls to use VK_WHOLE_SIZE

Calls were still using zero to map entire allocation which caused validation issues.
diff --git a/tests/vktestbinding.cpp b/tests/vktestbinding.cpp
index 307786f..89b2c13 100644
--- a/tests/vktestbinding.cpp
+++ b/tests/vktestbinding.cpp
@@ -441,7 +441,7 @@
 const void *DeviceMemory::map(VkFlags flags) const
 {
     void *data;
-    if (!EXPECT(vkMapMemory(device(), handle(), 0 ,0, flags, &data) == VK_SUCCESS))
+    if (!EXPECT(vkMapMemory(device(), handle(), 0 , VK_WHOLE_SIZE, flags, &data) == VK_SUCCESS))
         data = NULL;
 
     return data;
@@ -450,7 +450,7 @@
 void *DeviceMemory::map(VkFlags flags)
 {
     void *data;
-    if (!EXPECT(vkMapMemory(device(), handle(), 0, 0, flags, &data) == VK_SUCCESS))
+    if (!EXPECT(vkMapMemory(device(), handle(), 0,  VK_WHOLE_SIZE, flags, &data) == VK_SUCCESS))
         data = NULL;
 
     return data;