Merge pull request #3457 from yoniko/fix-rowhash-cli

[Bugfix] CLI row hash flags set the wrong values

`--[no-]row-match-finder` do the opposite of what they are supposed to.
In effect the no option would activate row hash while the other option will disable it.
This commit fixes the issue and changes the code to use the more readable enum values.

diff --cc programs/zstdcli.c
Simple merge