good but wrong teardown order; device wait idle

src/main.zig

@@ -29,7 +29,7 @@ pub fn main() !void {
     try nu.Render.init(alloc);
     defer nu.Render.deinit();
 
-    try nu.ImGui.init(alloc);
+    try nu.ImGui.init();
     defer nu.ImGui.deinit();
 
     try App.init(alloc);