Use MB suffix for arena initialization

src/main.c

@@ -205,7 +205,7 @@ int main(int argc, char **argv)
     char *library_path = noh_shift_args(&argc, &argv);
     SV base_path = sv(library_path);
 
-    temp = noh_arena_init(4 * 1024);
+    temp = noh_arena_init(1 MB);
     struct MHD_Daemon *server;
 
     // Start the HTTP server