add missing update scripts for schema v.17

schema/versions/mysql/17.sql

@@ -0,0 +1,3 @@
+insert into ttrss_prefs (pref_name,type_id,def_value,short_desc,section_id) values('_PREFS_ACTIVE_TAB', 2, '', '', 1);
+
+update ttrss_version set schema_version = 17;

schema/versions/pgsql/17.sql

@@ -0,0 +1,3 @@
+insert into ttrss_prefs (pref_name,type_id,def_value,short_desc,section_id) values('_PREFS_ACTIVE_TAB', 2, '', '', 1);
+
+update ttrss_version set schema_version = 17;