Replace cortana icon with search icon in Windows 10 v1607

I had the previous version of Windows 10 with Cortana disabled. Therefore, in the taskbar I had a loupe icon instead of the Cortana one.

Then I installed the Anniversary Update (v1607). For some reason, this replaced the loupe with the Cortana icon on all my computers.

Strangely, on my desktop PC, the icon was eventually automatically changed back to the loupe, like I want.

But my laptop still has the Cortana icon. I want to replace it with the loupe icon.

How can I do that manually?

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