Country config value should be checked against the valid value when
updating the home page config, not the other way around. This can lead
to a state where a user sets up an invalid country value, but can still
be matched against a correct value that is part of the invalid value
(i.e. "countryUK" is invalid, but would match against the correct value,
"UK")
Also minor refactor of where the session file size validation occurs.
ddc73a53fe