Shrink default path cache size

#define DEFAULT_TEXTURE_CACHE_SIZE 24.0f

#define DEFAULT_LAYER_CACHE_SIZE 16.0f

#define DEFAULT_RENDER_BUFFER_CACHE_SIZE 2.0f

#define DEFAULT_PATH_CACHE_SIZE 10.0f

#define DEFAULT_PATH_CACHE_SIZE 4.0f

#define DEFAULT_VERTEX_CACHE_SIZE 1.0f

#define DEFAULT_PATCH_CACHE_SIZE 128 // in kB

#define DEFAULT_GRADIENT_CACHE_SIZE 0.5f