[EFL] Clean up the web database-related functions in ewk_settings.

[EFL] Clean up the web database-related functions in ewk_settings.
https://bugs.webkit.org/show_bug.cgi?id=72139

Patch by Raphael Kubo da Costa <kubo@profusion.mobi> on 2011-11-16
Reviewed by Kenneth Rohde Christiansen.

Mostly remove some unnecessary ENABLE(SQL_DATABASE) checks and use a
more standard naming scheme for the related static variables.

* ewk/ewk_settings.cpp:
(ewk_settings_web_database_default_quota_get):
(ewk_settings_web_database_path_set):
(ewk_settings_web_database_path_get):
* ewk/ewk_settings.h: Document the default web database path on disk.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@100463 268f45cc-cd09-0410-ab3c-d52691b4dbfc