[stb_truetype] fix compound glyph scaling #1756
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The logic for handling composite glyph scaling doesn't match the truetype specs, hence the results are different when a glyph in a ttf file defines composite glyh scales. I couldn't really find a ttf font with a glyph that has this exact issue, but the specs allows both uniform and non-uniform scaling for composite glyphs.
Part of the spec i am referring to
Synthetic tests (intentionally add scale to glyph component, spec allows it)
Left is FontForger, Right is raylib
With this fix applied
