build: Fix ImageMagick_Magick++ search
build: Fix ImageMagick_Magick++ search

One cmake test was looking at ImageMagick_MagickWand_INCLUDE_DIR
instead of ImageMagick_Magick++_INCLUDE_DIR

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools