xkb: Silence a warning from gcc 11

I get this:

    In function ‘TryCopyStr’,
        inlined from ‘CopyISOLockArgs’ at ../xkb/xkbtext.c:875:9:
    ../xkb/xkbtext.c:720:13: warning: ‘tbuf’ may be used uninitialized [-Wmaybe-uninitialized]
      720 |             strcat(to, from);
          |             ^~~~~~~~~~~~~~~~
    ../xkb/xkbtext.c: In function ‘CopyISOLockArgs’:
    <built-in>: note: by argument 1 of type ‘const char *’ to ‘__builtin_strlen’ declared here
    ../xkb/xkbtext.c:871:10: note: ‘tbuf’ declared here
      871 |     char tbuf[64];
          |          ^~~~

Just initialize tbuf so it definitely works.

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