ci(mergify): fix T-ID-override rule name to match central baseline

The override shipped in 3d44fe06 used rule names `Flag PR title not
matching T-ID format` + `Flag commit message not matching T-ID format`.
Per Mergify `extends:` semantics, same-name rules in the child REPLACE
the parent's — and the central baseline in vyos/mergify uses a single
rule named `Flag T-ID format violation in PR title or commit messages`.
Different names → no replacement → parent rule keeps firing.

Symptom (surfaced on PR #2014, title `docs(readme): …`): every PR
without a `T<digits>:` token gets `invalid-title` labeled.

Fix: collapse to one rule, rename to match the parent exactly. The
condition (`closed AND -closed`) still never matches, so `toggle`
removes the label on every evaluation — picks up any stale
`invalid-title` from the broken-override window.

The parent rule does not toggle `invalid-commit-title`; the
second child rule for that label was extraneous and is dropped.

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