Fix missing '%' formatting in message() calls

[mxamin]

No description provided.

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[mxamin]

I have read the CLA Document and I hereby sign the CLA

[mxamin]

recheck

[mxamin]

@JorjMcKie Thanks for approving the PR. It seems that I can not merge it, can you do that so this will be included in the next release.

[mxamin]

@julian-smith-artifex-com I see the release but it seems that you missed this PR. Can you merge it so it will be in the next release? It's blocking our application and I have to monkey patch my code to handle this bug.

[julian-smith-artifex-com]

@julian-smith-artifex-com I see the release but it seems that you missed this PR. Can you merge it so it will be in the next release? It's blocking our application and I have to monkey patch my code to handle this bug.

Apologies, i'm looking at it now.

[julian-smith-artifex-com]

@mxamin many thanks for this contribution!