[TextServer] Fix hex code box positions in vertical text layout.

modules/text_server_adv/text_server_adv.cpp

@@ -5072,6 +5072,8 @@ void TextServerAdvanced::_shape_run(ShapedTextDataAdvanced *p_sd, int64_t p_star
 					p_sd->ascent = MAX(p_sd->ascent, get_hex_code_box_size(fs, gl.index).y);
 				} else {
 					gl.advance = get_hex_code_box_size(fs, gl.index).y;
+					gl.y_off = get_hex_code_box_size(fs, gl.index).y;
+					gl.x_off = -Math::round(get_hex_code_box_size(fs, gl.index).x * 0.5);
 					p_sd->ascent = MAX(p_sd->ascent, Math::round(get_hex_code_box_size(fs, gl.index).x * 0.5));
 					p_sd->descent = MAX(p_sd->descent, Math::round(get_hex_code_box_size(fs, gl.index).x * 0.5));
 				}