This is a minor change in the status bar message when starting bitcoin-qt with the reindex flag.
The user knows which option they passed to the program, so it seems overly verbose to offer the user feedback whether or not they passed -reindex. Treat it as DISK, like all other cases that are treated as DISK:
-reindex-chainstate
-loadblock
This is a backport of core-gui#697
Depends on D16004