Fix for retrieved metrics.

Fix for retrieved metrics.

* DALi is not able to correctly layout text for the
  SNum-3R font.

* Enable the SW emboldering as well when the metrics
  are retrieved.

* Use the bounding box of the glyph to correct the
  retrieved metrics used to layout the text.

* A scale factor is applied to the advance metric when
  a font is emboldened by software as Harfbuzz doesn't
  do it.

* Some code beautify.

Change-Id: I3b5167e382654b110177731db191325ce2f01c01
Signed-off-by: Victor Cebollada <v.cebollada@samsung.com>