Enable waterCollision after moving the player above water (Fixes #3672)

apps/openmw/mwphysics/physicssystem.cpp

@@ -1350,6 +1350,7 @@ namespace MWPhysics
                 {
                     const osg::Vec3f actorPosition = physicActor->getPosition();
                     physicActor->setPosition(osg::Vec3f(actorPosition.x(), actorPosition.y(), waterlevel));
+                    waterCollision = true;
                 }
             }
             physicActor->setCanWaterWalk(waterCollision);