Visibility turns to public after saving plain text snippet

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Steps to reproduce:

• Create a new plain text snippet
• Save it as private
• Edit it
• Save it
• Edit it again
• Save it

What should happen:

The snippet should stay private.

What actually happens:

The snippet becomes public.

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The bug occurs when displaying the edit screen after a save. In that screen, the Public option is selected even if the snippet is Private. When refreshing, it goes to Private again.