BUG/MINOR: quic: wrong QUIC_FT_CONNECTION_CLOSE(0x1c) frame encoding

BUG/MINOR: quic: wrong QUIC_FT_CONNECTION_CLOSE(0x1c) frame encoding

This is an old bug which was there since this commit:

     MINOR: quic: Avoid zeroing frame structures

It seems QUIC_FT_CONNECTION_CLOSE was confused with QUIC_FT_CONNECTION_CLOSE_APP
which does not include a "frame type" field. This field was not initialized
(so with a random value) which prevent the packet to be built because the
packet builder supposes the packet with such frames are very short.

Must be backported as far as 2.6.