Dump format verification

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This PR fixes two logic bugs in examples/backdrop-mysql-client/README.md where grep -v was incorrectly used for negation assertions. The previous commands always passed due to the nature of multi-line files or specific footer lines.

The changes update the grep commands to use the pattern grep <pattern> || echo $? | grep 1, which correctly asserts that a pattern is not found, aligning with existing codebase conventions for negation checks. Specifically, one fix targets the general "MariaDB dump" check, and the other refines the "Dump" check to specifically examine the header line to avoid false positives from footer lines.

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Automatically closed this PR because it was created by Bugbot autofix for #82, and that PR was closed.