Temporarily don't return the current buffer in synchronous mode

activate synchronous mode by default.
diff --git a/libs/gui/SurfaceTexture.cpp b/libs/gui/SurfaceTexture.cpp
index 2cda4c8..3cecdb4 100644
--- a/libs/gui/SurfaceTexture.cpp
+++ b/libs/gui/SurfaceTexture.cpp
@@ -271,7 +271,7 @@
             if (state == BufferSlot::DEQUEUED) {
                 dequeuedCount++;
             }
-            if (state == BufferSlot::FREE || i == mCurrentTexture) {
+            if (state == BufferSlot::FREE /*|| i == mCurrentTexture*/) {
                 foundSync = i;
                 if (i != mCurrentTexture) {
                     found = i;