MDL-32113 xmldb: Remove hard-coded exceptions for long number fields

We are going to unify the maximum supported precision of all numeric
fields to 38 digits (which are the current Oracle and MSSQL limits). Get
rid of hard-coded exceptions for longer fields.

lib/ddl/oracle_sql_generator.php

@@ -181,10 +181,6 @@ class oracle_sql_generator extends sql_generator {
             case XMLDB_TYPE_FLOAT:
             case XMLDB_TYPE_NUMBER:
                 $dbtype = $this->number_type;
-                // 38 is the max allowed
-                if ($xmldb_length > 38) {
-                    $xmldb_length = 38;
-                }
                 if (!empty($xmldb_length)) {
                     $dbtype .= '(' . $xmldb_length;
                     if (!empty($xmldb_decimals)) {