Revert "BUG/MAJOR: mux-quic: do not crash on connection error after glitch threshold"

Revert "BUG/MAJOR: mux-quic: do not crash on connection error after glitch threshold"

This reverts commit 19910335dc7513fdf2896c42f0d5a6283a7ab6f2.

The same bug that this patch fixed was also corrected via the following
serie. For now, keep the BUG_ON() in qcc_set_error() to detect incorrect
usages.

f739a0c37 BUG/MEDIUM: h3: fix BUG_ON() crash with glitch after QPACK dec err
fc9a503b1 BUG/MEDIUM: h3: fix BUG_ON() crash with glitch on GOAWAY parsing
15d9a2f32 BUG/MEDIUM: h3: fix BUG_ON() crash with glitch on SETTINGS parsing
8eb164e14 MINOR: h3: remove dead code on h3_rcv_buf() error path
745b12086 BUG/MINOR: h3: fix risk of BUG_ON() crash with glitch on unknown frame
c2d82a20b  BUG/MINOR: h3: fix BUG_ON() crash with glitch on htx_set_eom() failure