Fix: Vulkan Use Resource After Free

When immediate mode is used with a temp texture the
draw command was executed after the texture was freed.

This PR ensures that the draw command is executed before
the texture is freed.

Pull Request: https://projects.blender.org/blender/blender/pulls/111111

source/blender/gpu/vulkan/vk_immediate.cc

@@ -57,6 +57,8 @@ void VKImmediate::end()
   vertex_attributes_.bind(context);
 
   context.command_buffer_get().draw(0, vertex_len, 0, 1);
+  context.command_buffer_get().submit();
+
   buffer_offset_ += current_subbuffer_len_;
   current_subbuffer_len_ = 0;
 }