Fix: increase size for external module name

htdocs/install/mysql/migration/3.0.0-3.1.0.sql

@@ -482,3 +482,6 @@ ALTER TABLE llx_don ADD   phone_mobile    varchar(24) after email;
 ALTER TABLE llx_don ADD   phone           varchar(24) after email;
 
 ALTER TABLE llx_user ADD civilite varchar(6) after entity;
+
+ALTER TABLE llx_element_element MODIFY sourcetype varchar(32) NOT NULL;
+ALTER TABLE llx_element_element MODIFY targettype varchar(32) NOT NULL;
\ No newline at end of file