Set top and bottom boundary to no-flow velocity no-slip

appl/porescale/beaversjoseph/problem.hh

@@ -104,8 +104,6 @@ public:
 
         if (isInlet_(globalPos) || isOutlet_(globalPos))
             values.setDirichlet(Indices::pressureIdx);
-        else if (isOnUpperWall_(globalPos) || isOnLowerWall_(globalPos))
-            values.setAllSymmetry();
         else
         {
             values.setDirichlet(Indices::velocityXIdx);