Currently, there are two issues with the detailed staggered versioning
information displayed in the folder info. Firstly, the maxAge value of
365d is displayed despite matching the default. Secondly, there is no
consideration for the special case of maxAge equal to 0, meaning that
versions are kept forever.
This commit fixes both of those issues, so that the default maxAge is
not displayed and its value of 0 is displayed as "forever".
Signed-off-by: Tomasz Wilczyński <twilczynski@naver.com>