Automatic update from web-platform-tests
Call verifySelectedSnapTarget for single axis (#59386)
verifySelectedSnapTarget only handles passing a single axis as
the axis parameter to it gracefully.
runScrollSnapSelectionVerificationTest might call it with axis=="both"
which could yield wrong results.
This changes calls verifySelectedSnapTarget twice (once for x, once for y)
in case axis=="both".
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wpt-commits: b6ca80c575d8a81c3137002dca9838a278ed5f72
wpt-pr: 59386