GlobalFunctions: Fix wfPercent() with negative accuracy

Format strings like "%.-1f" have never been valid, however
while previously it would have resulted in output being "1f",
in PHP 8 it's an exception. The existing unit test failed because
(float)"1f" evaluates to 1, which was rounded down to an expected 0.
Adding another test case to make sure it can return anything other
than "0%" on PHP 7.

While I'm at it, fix wrong phpdoc and add parameter types to this
function.

Bug: T248925
Change-Id: I018bc17a563c58535f6c84644d707251ab19cd0a

0 files changed, 0 insertions, 0 deletions