minor update regarding --current-db on Oracle

xml/queries.xml

@@ -230,7 +230,11 @@
         <inference query="ASCII(SUBSTR((%s),%d,1)) > %d"/>
         <banner query="SELECT banner FROM v$version WHERE ROWNUM=1"/>
         <current_user query="SELECT USER FROM DUAL"/>
+        <!--
+        NOTE: current physical DB but not usable for enumeration
         <current_db query="SELECT SYS.DATABASE_NAME FROM DUAL"/>
+        -->
+        <current_db query="SELECT USER FROM DUAL"/>
         <!--
              NOTE: in Oracle to check if the session user is DBA you can use:
              SELECT USERENV('ISDBA') FROM DUAL