avelsieve: Fixes for php7

Good day,

during making packages for php7 (https://mifritscher.de/squirrelmail/) I
stumbled over 2 problems:

  * duplicate default in switch. Killed by sed -i '584d'
include/sieve_buildrule.inc.php.

  * deprecated constructors:

mod_fcgid: stderr: PHP Deprecated:  Methods with the same name as their
class will not be constructors in a future version of PHP;
avelsieve_action has a deprecated constructor in
/usr/share/squirrelmail/plugins/avelsieve/include/avelsieve_action.class.php
on line 30
mod_fcgid: stderr: PHP Deprecated:  Methods with the same name as their
class will not be constructors in a future version of PHP; DO_Sieve has
a deprecated constructor in
/usr/share/squirrelmail/plugins/avelsieve/include/DO_Sieve.class.php on
line 20

Best regards,
Michael Fritscher

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