[NUI] remove unnecessary code that flex margin is assigned to flexlayout (#2272)

Sicne the margin of FlexLayout will be handled by the parent layout,
we don't need to re-assign margin in `OnMeasure`.

diff --git a/src/Tizen.NUI/src/public/Layouting/FlexLayout.cs b/src/Tizen.NUI/src/public/Layouting/FlexLayout.cs
index 1c8dbec..b1502f7 100755 (executable)
--- a/src/Tizen.NUI/src/public/Layouting/FlexLayout.cs
+++ b/src/Tizen.NUI/src/public/Layouting/FlexLayout.cs
@@ -655,9 +655,7 @@ namespace Tizen.NUI
         {
             bool isLayoutRtl = Owner.LayoutDirection == ViewLayoutDirectionType.RTL;
             Extents padding = Owner.Padding;
-            Extents margin = Owner.Margin;
 
-            Interop.FlexLayout.FlexLayout_SetMargin(swigCPtr, Extents.getCPtr(margin));
             Interop.FlexLayout.FlexLayout_SetPadding(swigCPtr, Extents.getCPtr(padding));
 
             float width = FlexUndefined; // Behaves as WrapContent (Flex Auto)