dirstate-v2: rename the configuration to enable the format
The rename of the old experimental name was overlooked before the 6.0 release.
We rename everything to use the new name (and keep the released name as an alias
for compatibility).
Differential Revision: https://phab.mercurial-scm.org/D12129
edition = "2018"
max_width = 79
wrap_comments = true
error_on_line_overflow = true