Revert "gta4xl-common: don't latch unsignal buffers"

This reverts commit ab7d2b4ad888c557dcb27fd8b5ed2e660fa3848f.

Change-Id: Iea47ca5af1ecc13caefba1b040c05a7885a50886
diff --git a/vendor.prop b/vendor.prop
index 4ea3cb8..c6a70f9 100644
--- a/vendor.prop
+++ b/vendor.prop
@@ -42,6 +42,7 @@
 
 ## Graphics
 debug.sf.auto_latch_unsignaled=0
+debug.sf.latch_unsignaled=1
 ro.hardware.egl=mali
 ro.opengles.version=196610
 ro.surface_flinger.enable_frame_rate_override=false