Only format /data in recovery if user specified a new fstype

recovery mode does not have key services, so formatting volumes in
recovery would result in an unencrypted image.
If init detects an unencrypted /data image, encrypt_inplace would be
called. We would like to avoid using `encrypt_inplace` in production.
So do not format /data in recovery for regular data wipes.

Test: th
Bug: 293313353
Change-Id: I401da2a876ed22b426872c80c231397c12ec0737