Fix elog format error in wallog_mapping_file (#5602)

## Problem

Fix elog format error in wallog_mapping_file 

## Summary of changes

Use proper case to avoid compilation warning=error in C at MacOS.


## Checklist before requesting a review

- [ ] I have performed a self-review of my code.
- [ ] If it is a core feature, I have added thorough tests.
- [ ] Do we need to implement analytics? if so did you add the relevant
metrics to the dashboard?
- [ ] If this PR requires public announcement, mark it with
/release-notes label and add several sentences in this section.

## Checklist before merging

- [ ] Do not forget to reformat commit message to not include the above
checklist

Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>

vendor/revisions.json

@@ -1,5 +1,5 @@
 {
-    "postgres-v16": "e5e255d2da05bc5f884b871c042014030a114a9b",
-    "postgres-v15": "23f2d411020a739375b32895ce1362ded2962084",
-    "postgres-v14": "ebcca9e9eb49621b5b17247833b59e836337e8aa"
+    "postgres-v16": "550ffa6495a5dc62fccc3a8b449386633758680b",
+    "postgres-v15": "ab67ab96355d61e9d0218630be4aa7db53bf83e7",
+    "postgres-v14": "6669a672ee14ab2c09d44c4552f9a13fad3afc10"
 }