shadow: Increase the maximum group name length to 32 (the default)

shadow: Increase the maximum group name length to 32 (the default)

Back in 2014, the maximum group name length was increased from 16 (the
default) to 24. Since then, the default has increased to 32, and our
configuration is now actually a decrease in maximum group name length.

Remove the configuration to use the default instead, which aligns the
maximum group name length with the maximum user name length.

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>