MDEV-12645: mysql_install_db --no-test (postfix

mysql_test_db.sql is in the srcdir

scripts/mysql_install_db.sh

@@ -350,7 +350,7 @@ create_system_tables="$srcpkgdatadir/mysql_system_tables.sql"
 create_system_tables2="$srcpkgdatadir/mysql_performance_tables.sql"
 fill_system_tables="$srcpkgdatadir/mysql_system_tables_data.sql"
 maria_add_gis_sp="$buildpkgdatadir/maria_add_gis_sp_bootstrap.sql"
-mysql_test_db="$buildpkgdatadir/mysql_test_db.sql"
+mysql_test_db="$srcpkgdatadir/mysql_test_db.sql"
 
 for f in "$fill_help_tables" "$create_system_tables" "$create_system_tables2" "$fill_system_tables" "$maria_add_gis_sp" "$mysql_test_db"
 do