edje/style: optimize updation of styles for a given text_style

edje/style: optimize updation of styles for a given text_style

Currently we do 2 pass updation. first we scan through all the styles
and check if they have text_style which matches the test_style we need to update
then we mark them dirty. then we call style_all_update() to go through the list
again and update those styles.
By combining them both in a single function we avoid scanning through the whole
list again.

Reviewed-by: Cedric BAIL <cedric.bail@free.fr>
Differential Revision: https://phab.enlightenment.org/D9639

Change-Id: I28ee8aa29b64759116ed45c17905a0ed4a00dba2