Fix GH-16406: Assertion failure in ext/phar/phar.c:2808

When copying entries during conversion in phar_convert_to_other(), the
header offset is not reset. This didn't matter in the past

Fix GH-16406: Assertion failure in ext/phar/phar.c:2808

When copying entries during conversion in phar_convert_to_other(), the
header offset is not reset. This didn't matter in the past as it wasn't
used anyway in the particular use-case, but since 1bb2a4f9 this is
actually used and sanity-checked.

Closes GH-16470.

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