linearlayout: fix measurement of childrens when parent and childrens have exactly the same pixels

When children measure exactly the same width/height than the parent, any child with
width/height == 0 and with weight > 0 must be reset. Otherwise, the view will retains
the same width/height between measurements calls (that is not valid if the view changed
its orientation).

This explain the bug in CYAN-5471 when in hpdi devices the spacer view has the same
width after rotate from landscape to portrait when language is german and date beewteen
September 10-30. Steps to repro in i9100 (hdpi):

1.- Set language to german and date to September, 10.
2.- First run, the expanded bar has the same width that its children (480px the current
screen size), but spacer has 0px (because it isn't being measured by linearlayout).
3.- Rotate to landscape, spacer gains space and all buttons are displayed correctly.
4.- Rotate to portrait, spacer has the same width that in step 3, because it isn't measured
again and delta == 0;

This patch forces this views to be re-measured to 0 to match the current delta (the views doesn't
need to be expanded or shrinked).

JIRA: CYAN-5471
https://jira.cyanogenmod.org/browse/CYAN-5471
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>

Change-Id: Iab60337eca6ded7b2b4d57fdcc95863be461db34