Remove RN Android's bizarre font weight extension pattern

[stevenpetryk]

This is a simple change to ignore the way that RN's Android code searches for fonts with a _bold, _italic, or _bold_italic suffix in their filename. In Discord's codebase we just declare the font family, but some of our libraries don't do that (namely react-navigation), so this change should help an issue where some headings are using Roboto because this is trying to find a font matching fontWeight: 700.

We'll need to revert this change once we rework how we do fonts on RN (since currently we're a bit off-book).

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