Summary:
634567d / D40823 appeared to have landed an older diff than the last tested one, leading
to the following compile error on GCC builds:
```
/-------------------------------------------------------------------------------
| COMPILATION FAILED
|-------------------------------------------------------------------------------
../../../../../../../src/postgres/src/backend/utils/misc/yb_query_diagnostics.c:126:49: error: missing braces around initializer [-Werror=missing-braces]
126 | static QueryConstantsMetadata query_constants = {0, 0, {0}};
| ^
| {}
cc1: all warnings being treated as errors
```
This fixes the compile error.
Jira: DB-14918
Test Plan: Jenkins: urgent, compile only
Reviewers: asaha, ishan.chhangani, mhaddad
Reviewed By: mhaddad
Subscribers: yql, ybase
Tags: #jenkins-ready
Differential Revision: https://phorge.dev.yugabyte.com/D41293