Removed unnecessary imports from circuit drawer example code

[emilkovacev]

Simple fix, just removed imports that aren't used to make the code block work.

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[Eric-Arellano]

Hi, thanks! Why did you close this?

[emilkovacev]

Hi @Eric-Arellano, it seemed like I was supposed to open this issue in Qiskit repository instead, since the code is in a code block. Is that correct?

[Eric-Arellano]

Ah, yes, that's correct. I didn't notice that. Thanks!