[2.2.0] Checkmk Werk 15298 created: mk_oracle: restore compatibility with oracle 12c

Title: mk_oracle: restore compatibility with oracle 12c Class: fix Compatible: compat Component: agents Date: 1698138075 Edition: cre Knowledge: doc Level: 1 Version: 2.2.0p18 <a href="https://checkmk.com/werk/14839">Werk #14839</a> added the function <tt>listagg</tt> to one of our queries. Older versions of oracle database expect a <tt>WITHIN</tt> statement after the <tt>listagg</tt> function. This was added to assure compatibility with older databases.