VK: Fixed swizzle macro.

src/renderer_vk.cpp

@@ -166,7 +166,7 @@ VK_IMPORT_DEVICE
 #define $R VK_COMPONENT_SWIZZLE_R
 #define $G VK_COMPONENT_SWIZZLE_G
 #define $B VK_COMPONENT_SWIZZLE_B
-#define $A VK_COMPONENT_SWIZZLE_B
+#define $A VK_COMPONENT_SWIZZLE_A
 		{ VK_FORMAT_BC1_RGB_UNORM_BLOCK,       VK_FORMAT_BC1_RGB_UNORM_BLOCK,      VK_FORMAT_UNDEFINED,           VK_FORMAT_BC1_RGB_SRGB_BLOCK,       { $_, $_, $_, $_ } }, // BC1
 		{ VK_FORMAT_BC2_UNORM_BLOCK,           VK_FORMAT_BC2_UNORM_BLOCK,          VK_FORMAT_UNDEFINED,           VK_FORMAT_BC2_SRGB_BLOCK,           { $_, $_, $_, $_ } }, // BC2
 		{ VK_FORMAT_BC3_UNORM_BLOCK,           VK_FORMAT_BC3_UNORM_BLOCK,          VK_FORMAT_UNDEFINED,           VK_FORMAT_BC3_SRGB_BLOCK,           { $_, $_, $_, $_ } }, // BC3