hwui: Fix the length of partial updates system property

The maximum length of a system property is 31 bytes.
debug.hwui.enable_partial_updates is 33 bytes

Change-Id: Idb1b1a00294dd29f84530e8aee1f685094d0096f
diff --git a/libs/hwui/Properties.h b/libs/hwui/Properties.h
index a1dadc8..881bd5f 100644
--- a/libs/hwui/Properties.h
+++ b/libs/hwui/Properties.h
@@ -149,7 +149,7 @@
  * This will disable the use of EGL_EXT_buffer_age and BUFFER_PRESERVED.
  * Default is "true"
  */
-#define PROPERTY_ENABLE_PARTIAL_UPDATES "debug.hwui.enable_partial_updates"
+#define PROPERTY_ENABLE_PARTIAL_UPDATES "debug.hwui.use_partial_updates"
 
 #define PROPERTY_FILTER_TEST_OVERHEAD "debug.hwui.filter_test_overhead"