Add blank_unblank_on_init to PRIVATE_RECOVERY_UI_PROPERTIES

...in order for it to end up in recovery properties.

Required after 139c7270361a421592705836391ebb48dafaba57

Change-Id: Ibc13eeaabbd24f04b1cea103281d6d98f7956729
diff --git a/core/Makefile b/core/Makefile
index 9ad0635..290ac4e 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -2665,6 +2665,7 @@
 
 $(INSTALLED_RECOVERY_BUILD_PROP_TARGET): PRIVATE_RECOVERY_UI_PROPERTIES := \
     TARGET_RECOVERY_UI_ANIMATION_FPS:animation_fps \
+    TARGET_RECOVERY_UI_BLANK_UNBLANK_ON_INIT:blank_unblank_on_init \
     TARGET_RECOVERY_UI_MARGIN_HEIGHT:margin_height \
     TARGET_RECOVERY_UI_MARGIN_WIDTH:margin_width \
     TARGET_RECOVERY_UI_MENU_UNUSABLE_ROWS:menu_unusable_rows \