* Removes the font's style string from the InputStyle struct.
This string is useless as it stores only the string style set
through the property system. This string does not contain
the valid font's style if the style changes as a consequence of
moving the cursor.
Change-Id: I41d05f3686d949e1b50233df7f6d05fc2583af92 Signed-off-by: Victor Cebollada <v.cebollada@samsung.com>