Make system partition wipeable in gui

Author: zeelog

recovery/root/system/etc/twrp.fstab

@@ -2,7 +2,7 @@
 /boot           emmc   /dev/block/bootdevice/by-name/boot
 /cache          ext4   /dev/block/bootdevice/by-name/cache
 /recovery       emmc   /dev/block/bootdevice/by-name/recovery                    flags=backup=1
-/system_root    ext4   /dev/block/bootdevice/by-name/system                      flags=backup=0;display="System"
+/system_root    ext4   /dev/block/bootdevice/by-name/system                      flags=backup=0;display="System";wipeingui
 /vendor         ext4   /dev/block/bootdevice/by-name/cust                        flags=display="Vendor";wipeingui
 
 /system_image   emmc   /dev/block/bootdevice/by-name/system