openaes: fully remove from build with encrypted backups disabled

Change-Id: I7941d90deb6c07bd354bfd5594b76a25ceccef1e
diff --git a/Android.mk b/Android.mk
index 53a0884..f27ac4b 100755
--- a/Android.mk
+++ b/Android.mk
@@ -509,7 +509,7 @@
 ifeq ($(BOARD_HAS_NO_REAL_SDCARD),)
     TWRP_REQUIRED_MODULES += sgdisk
 endif
-ifneq ($(TW_EXCLUDE_ENCRYPTED_BACKUPS), true)
+ifneq ($(TW_EXCLUDE_ENCRYPTED_BACKUPS),)
     TWRP_REQUIRED_MODULES += openaes openaes_license
 endif
 ifeq ($(TW_INCLUDE_DUMLOCK), true)