seq: use safer way to copy strings

seq: use safer way to copy strings

The call of strncpy can results in destination buffer without null as
terminator in the case of truncation. Compiler reports the risk as
warnings, like:

In function ‘strncpy’,
    inlined from ‘alsaseq_get_queue_info_by_name’ at ../src/seq/query.c:670:5:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:95:10: warning: ‘strncpy’ specified bound 64 equals destination size [-Wstringop-truncation]
   95 |   return __builtin___strncpy_chk (__dest, __src, __len,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   96 |       __glibc_objsize (__dest));
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~

This commit uses safer way to copy strings, g_strlcpy(), to fix the bug.

Fixes: 4e8675f631ce ("seq: client_info: add properties and accessor methods")
Fixes: f3457eaf706b ("seq: port_info: add properties")
Fixes: 1eabdf6bc647 ("seq: add global method to get the information of queue")
Fixes: f26342b3ab3d ("seq: queue_info: add properties and constructors")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>