Fix another problem with refreshing the screen when switching to/from overlay

the previous fix was incorrect. See comment in setupHardwareComposer for
full explanations.

Change-Id: Ib24a9af000b8f95cf7319f9272d34997064ceb6d
diff --git a/services/surfaceflinger/LayerBase.cpp b/services/surfaceflinger/LayerBase.cpp
index a63dcd3..e5ce814 100644
--- a/services/surfaceflinger/LayerBase.cpp
+++ b/services/surfaceflinger/LayerBase.cpp
@@ -43,7 +43,7 @@
     : dpy(display), contentDirty(false),
       sequence(uint32_t(android_atomic_inc(&sSequence))),
       mFlinger(flinger), mFiltering(false),
-      mNeedsFiltering(false),
+      mNeedsFiltering(false), mInOverlay(false),
       mOrientation(0),
       mTransactionFlags(0),
       mPremultipliedAlpha(true), mName("unnamed"), mDebug(false),