Fix (30120 IO-Link) 0007373:1:PDDescriptor variable has wrong default value type

[mlang-de]

Remove obsolete, wrong default value.

[CLAassistant]

All committers have signed the CLA.

[opcfoundation-org]

The is a process that needs to be followed to update NodeSets:

1. Mantis issue created;
2. WG must decide is a spec revision is required or only a fix to the NodeSet;
3. The updated NodeSet is submitted to Technical Director
4. The updated NodeSet is checked into the member-only repo
5. The updated NodeSet is released in the public repo and published to the UA-CloudLibrary

The process is cumbersome for simple fixes but it is needed for anything beyond the most trivial.