Fix clock offset extraction dropping positive values

ntpq's "rv 0 offset" prefixes non-negative offsets with an explicit
"+" (e.g. "offset=+0.030208"), which wasn't in the sed capture class
([-0-9.]). Since the capture group is starred, the regex still
"matched" with an empty capture instead of failing outright, silently
producing "no response" for every positive/zero offset while negative
ones (which do use "-", already in the class) worked fine. Confirmed
against the real box: earlier renders with negative drift worked,
then it started showing "no response" once the drift crossed zero.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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