test-selinux: place %m after %[sf] (#4977)

"%d (%m) %s\n" crashes asan: https://github.com/google/sanitizers/issues/759
So, let's place %m after %s

Fixes:
```
$ ./libtool --mode=execute ./test-selinux
...
============ test_misc ==========
ASAN:DEADLYSIGNAL
=================================================================
==2981==ERROR: AddressSanitizer: SEGV on unknown address 0x000041b58ab3 (pc 0x7fd9c55a0eb2 bp 0x7fffdc2f9640 sp 0x7fffdc2f8d68 T0)
    #0 0x7fd9c55a0eb1  (/lib64/libasan.so.3+0xdeeb1)
    #1 0x7fd9c5550bbf  (/lib64/libasan.so.3+0x8ebbf)
    #2 0x7fd9c5552cdd in __interceptor_vsnprintf (/lib64/libasan.so.3+0x90cdd)
    #3 0x7fd9c5063715 in log_internalv src/basic/log.c:680
    #4 0x7fd9c506390a in log_internal src/basic/log.c:697
    #5 0x561d398181a2 in test_misc src/test/test-selinux.c:81
    #6 0x561d398185e8 in main src/test/test-selinux.c:117
    #7 0x7fd9c493a400 in __libc_start_main (/lib64/libc.so.6+0x20400)
    #8 0x561d39817859 in _start (/home/vagrant/systemd-asan/.libs/lt-test-selinux+0x1859)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/lib64/libasan.so.3+0xdeeb1)
==2981==ABORTING
```