[NUI] Fix MatchParent to fill remaining space in LinearLayout

[NUI] Fix MatchParent to fill remaining space in LinearLayout

Previously, in LinearLayout, LayoutParamPolicies.MatchParent sets child
size to its parent size.

Now, in LinearLayout, LayoutParamPolicies.MatchParent calculates the
remaining space of parent and fills child in the remaining space of
parent.

There are 2 cases to fill child in the remaining space of parent.
1. MatchParent (both with or without weight)
 - If child has MatchParent specification, then child is filled in the
   remaining space of parent.
2. Specification 0 with weight
 - If child has zero specification and weight is greater than 0, then
   child is filled in the remaining space of parent proportional to its
   weight.