vulkan: only set cubemap compatibility for array textures with >= 6 layers.

src/modules/graphics/vulkan/Texture.cpp

@@ -112,7 +112,7 @@ bool Texture::loadVolatile()
 			}
 		}
 
-		if (texType == TEXTURE_CUBE || texType == TEXTURE_2D_ARRAY)
+		if (texType == TEXTURE_CUBE || (texType == TEXTURE_2D_ARRAY && layerCount >= 6))
 			createFlags |= VK_IMAGE_CREATE_CUBE_COMPATIBLE_BIT;
 
 		msaaSamples = vgfx->getMsaaCount(requestedMSAA);