This partially reverts commit 9274f33d.
The pattern is bogus, it blocks other patterns from running after empty lines.

Merge the "1 focused goal" line with the subsequent "(shelved: 1)" line,
since this is the new output in Coq 8.15+.

Iris does not currently produce this output, since no test calls `Show`
with shelved goals, but this future-proofs the test normalization.