add zsh to usr_shell regex

sql/database-fill.sql

@@ -600,7 +600,7 @@ REPLACE INTO table_regex VALUES ('users','uid_idx','text','regex','^[\\d]+$',1,1
 REPLACE INTO table_regex VALUES ('users','usr_phone','text','regex','^[-\\d\\(\\)\\+\\.x ]+$',7,64,NULL);
 REPLACE INTO table_regex VALUES ('users','usr_name','text','regex','^[-\\w\\. ]+$',4,64,NULL);
 REPLACE INTO table_regex VALUES ('users','usr_email','text','regex','^([-\\w\\+\\.]+)\\@([-\\w\\.]+)$',3,64,NULL);
-REPLACE INTO table_regex VALUES ('users','usr_shell','text','regex','^(csh|sh|bash|tcsh)$',0,0,NULL);
+REPLACE INTO table_regex VALUES ('users','usr_shell','text','regex','^(csh|sh|bash|tcsh|zsh)$',0,0,NULL);
 REPLACE INTO table_regex VALUES ('users','usr_title','text','redirect','default:tinytext',0,0,NULL);
 REPLACE INTO table_regex VALUES ('users','usr_affil','text','redirect','default:tinytext',0,0,NULL);
 REPLACE INTO table_regex VALUES ('users','usr_addr','text','redirect','default:tinytext',0,0,NULL);