System/Libraries/Graphics2D: Chop 16px off X2 max pos in @get_truetype_text_width()

This is a quick and dirty hack to compensate for artifacts at the far
right edge of the font rasterization buffer. Chopping off 16px allows us
to get the proper width of the rasterized text.

System/Libraries/Graphics2D.HC

@@ -1172,6 +1172,7 @@ I64 @get_truetype_text_width(U8* font_name, I64 size, U8* text)
     CDC* dc = DCNew(Display.Width(), (size * 2));
     Free(dc->body);
     dc->body = @stbtt_RenderText(font, dc->width_internal, dc->height, ToI64(size * 1.2), text);
+    dc->width -= 16;
     res = X2Pos(dc) - X1Pos(dc);
     DCDel(dc);
     return res;