Fix a method reference

Author: Happypig375

CSharpMath/Display/Typesetter.cs

@@ -702,7 +702,7 @@ private InnerDisplay<TFont, TGlyph> MakeInner(Inner inner, Range range) {
 
       var leftGlyph =
         inner.LeftBoundary is Boundary { Nucleus: var left } && left?.Length > 0
-        ? _FindGlyphForBoundary(left, glyphHeight)
+        ? FindGlyphForBoundary(left, glyphHeight)
         : null;
 
       var rightGlyph =