Fix mesh draw count

I replaced magic number with a good define.

graphics/src/vulkan_buffers.c

@@ -363,7 +363,7 @@ rse_err_t record_command_buffer(struct graphics_context_t* context, uint32_t ima
     vkCmdBindDescriptorSets(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, context->pipelines_data.pipeline_layout, 0,
                             1, &descriptor_set, 0, NULL);
 
-    for (i = 0; i < 2; ++i) {
+    for (i = 0; i < MAX_MESH_NUMBER; ++i) {
         VkBuffer instance_buffer = {context->instance_buffers[i].buffer};
 
         vkCmdBindVertexBuffers(command_buffer, 1, 1, &instance_buffer, offsets);