GuidedStepFragment: continue fix subActions

Last CL didn't consider both subActions Adapter
and actions Adapter share the same GuidedActionStylelist.
When we call setActions on subActions, we shouldn't
collapse subActions.

Bug: 32858270
Test: GuidedStepFragmentTest on API 19 and O/master

Change-Id: Ib6e2a0eafd32c8fb8be6bac5b86bdfa36d9976df
diff --git a/v17/leanback/src/android/support/v17/leanback/widget/GuidedActionAdapter.java b/v17/leanback/src/android/support/v17/leanback/widget/GuidedActionAdapter.java
index 455335f..7d2904a 100644
--- a/v17/leanback/src/android/support/v17/leanback/widget/GuidedActionAdapter.java
+++ b/v17/leanback/src/android/support/v17/leanback/widget/GuidedActionAdapter.java
@@ -151,7 +151,9 @@
      * @param actions The list of actions to be managed.
      */
     public void setActions(List<GuidedAction> actions) {
-        mStylist.collapseAction(false);
+        if (!mIsSubAdapter) {
+            mStylist.collapseAction(false);
+        }
         mActionOnFocusListener.unFocus();
         mActions.clear();
         mActions.addAll(actions);