Prevent Yoga from stretch-fitting height of subview

Yoga does that (stretch fits) when header config has its size set.
When header config does not have size (height) defined upfront,
this does not happen. It uses different SizingMode then.

Author: kkafar

common/cpp/react/renderer/components/rnscreens/RNSScreenStackHeaderConfigComponentDescriptor.h

@@ -34,8 +34,8 @@ class RNSScreenStackHeaderConfigComponentDescriptor final
         shadowNode.getState());
     auto stateData = state->getData();
 
-    if (stateData.frameSize.width != 0 && stateData.frameSize.height != 0) {
-      layoutableShadowNode.setSize(stateData.frameSize);
+    if (stateData.frameSize.width != 0) {
+      layoutableShadowNode.setSize({stateData.frameSize.width, YGUndefined});
 #ifdef ANDROID
       layoutableShadowNode.setPadding({
           stateData.paddingStart,