practices: Fix BestPractices-ImageBarrierAccessLayout again

It turns out that the table from KhronosGroup#2918 had an implicit "(can be 0)"
on almost every line. The 2 weird cases are:
GENERAL - Any (must not be 0)
PRESENT_SRC_KHR - Must be 0

Fixes KhronosGroup#4735

layers/best_practices_utils.cpp

@@ -1615,18 +1615,18 @@ bool BestPractices::ValidateAccessLayoutCombination(const std::string& api_name,
                                                     VkImageAspectFlags aspect) const {
     bool skip = false;
 
-    const VkAccessFlags all = VK_ACCESS_FLAG_BITS_MAX_ENUM;
-    bool none_allowed = false;
-    VkAccessFlags allowed = 0;
+    const VkAccessFlags2 all = UINT64_MAX;  // core validation is responsible for detecting undefined flags.
+    bool none_allowed = true;
+    VkAccessFlags2 allowed = 0;
 
     // Combinations taken from https://github.com/KhronosGroup/Vulkan-ValidationLayers/issues/2918
     switch (layout) {
         case VK_IMAGE_LAYOUT_UNDEFINED:
             allowed = all;
-            none_allowed = true;
             break;
         case VK_IMAGE_LAYOUT_GENERAL:
             allowed = all;
+            none_allowed = false;  // PR table says "Any (must not be 0)"
             break;
         case VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL:
             allowed = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT |
@@ -1679,12 +1679,10 @@ bool BestPractices::ValidateAccessLayoutCombination(const std::string& api_name,
             allowed = VK_ACCESS_SHADER_READ_BIT | VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_READ_BIT;
             break;
         case VK_IMAGE_LAYOUT_PRESENT_SRC_KHR:
-            allowed = VK_ACCESS_NONE;
-            none_allowed = true;
+            allowed = VK_ACCESS_NONE;  // PR table says "Must be 0"
             break;
         case VK_IMAGE_LAYOUT_SHARED_PRESENT_KHR:
             allowed = all;
-            none_allowed = true;
             break;
         case VK_IMAGE_LAYOUT_SHADING_RATE_OPTIMAL_NV:
             allowed = VK_ACCESS_SHADING_RATE_IMAGE_READ_BIT_NV;