twentysixteen: Keep cite in italics within blockquote

[Tamaranch]

This is a way to fix the bug mentioned below. Note that the change for the editor doesn't seem to be enough: italics aren't being applied for me, unlike in the final result. That said, I suppose this change needs to be made regardless.

Trac ticket: https://core.trac.wordpress.org/ticket/65107

Use of AI Tools

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