H2: remove a rather useless limit on the number of streams

H2: remove a rather useless limit on the number of streams

Origin: upstream, https://code.qt.io/cgit/qt/qtbase.git/commit/?id=46940ca73791e87e
Last-Update: 2022-06-20

SETTINGS for max concurrect number of streams is 'one direction' - this
is how our peer conveys the possible number of streams _we_ can open,
not _them_. If they choose to have it unlimited - let it be so.

It's possible to send 0 as maximum number, also, it's possible to
reduce the maximum compared to initial at some point - then I have
to avoid integer overflows.

Gbp-Pq: Name remove_limit_on_number_of_streams.diff