Add an option to one click flash current booted TWRP ramdisk

Change-Id: I12303696698a5feaa43401bcac9e30d5b3b99a0c
diff --git a/variables.h b/variables.h
index d1f3786..52ce4fc 100755
--- a/variables.h
+++ b/variables.h
@@ -147,6 +147,7 @@
 #define TW_NO_SHA2                  "tw_no_sha2"
 #define TW_UNMOUNT_SYSTEM           "tw_unmount_system"
 #define TW_IS_SUPER                 "tw_is_super"
+#define TW_AUTO_REFLASHTWRP_VAR     "tw_auto_reflashtwrp"
 
 // Also used:
 //   tw_boot_is_mountable