Fix bug #8052320 RelativeLayout is not having the correct width when in RTL mode - part 2

This is a fix for  RelativeLayout in RTL mode

- visible effect: wrong positioning of components
- the width computation (first pass) in RTL mode was wrong: it was missing the application
of the horizontal rules before measuring the children horizontally. This is now doing the
same as the normal LTR pass (except positioning the component which is done in the second
pass)

See related issue:

bug #8051633 Recent Apps thumbnails in RTL mode (Arabic / Hebrew / Farsi) should be aligned

Change-Id: I710de1a504bec8743f8e3c13f6ff850055edb2d2