Replaced last BuildConfig.DEBUG with ActionBarSherlock.DEBUG

One BuildConfig.DEBUG was missed in this commit https://github.com/JakeWharton/ActionBarSherlock/commit/1ccd2d54e1ba77cd1b2ecd1b5c716e0e6dd5252a

This fixes https://github.com/JakeWharton/ActionBarSherlock/issues/1001