fix: KplMessageHandler.setGlueSchema()

[boolivar]

This PR fixes typo in KplMessageHandler.setGlueSchema method.

Considered this as trivial change so no issue created.
Also I'm not sure if integration test change is appropriate.

Glad to see any feedback, thanks!

[artembilan]

Thanks.
Please, consider to fix DCO requirements:

There is one commit incorrectly signed off. This means that the author of this commit failed to include a Signed-off-by line in the commit message.
To avoid having PRs blocked in the future, always include Signed-off-by: Author Name [email protected] in every commit message. You can also do this automatically by using the -s flag (i.e., git commit -s).
Here is how to fix the problem so that this code can be merged.