runmode/unix-socket: fix cppcheck warnings

runmode/unix-socket: fix cppcheck warnings

src/runmode-unix-socket.c:547:9: warning: %d in format string (no. 1) requires 'int' but the argument type is 'unsigned int'. [invalidPrintfArgType_sint]
        snprintf(tstr, sizeof(tstr), "%d", cfile->tenant_id);
        ^
src/runmode-unix-socket.c:1040:5: warning: %d in format string (no. 1) requires 'int' but the argument type is 'unsigned int'. [invalidPrintfArgType_sint]
    snprintf(prefix, sizeof(prefix), "multi-detect.%d", tenant_id);
    ^
src/runmode-unix-socket.c:1189:5: warning: %d in format string (no. 1) requires 'int' but the argument type is 'unsigned int'. [invalidPrintfArgType_sint]
    snprintf(prefix, sizeof(prefix), "multi-detect.%d", tenant_id);
    ^