[osx, canvas] revert to 16 pixel wide tiles. 32 gives some benefit for a few large paths, but degrades too much for higher segment counts

src/mtl_renderer.m

@@ -17,7 +17,7 @@
 #include"mtl_renderer.h"
 
 const int MG_MTL_INPUT_BUFFERS_COUNT = 3,
-          MG_MTL_TILE_SIZE = 32,
+          MG_MTL_TILE_SIZE = 16,
           MG_MTL_MSAA_COUNT = 8;
 
 typedef struct mg_mtl_canvas_backend