kernel32/tests: fni->FileName is not nul terminated in test_readdirectorychanges_cr

[Dan Kegel]

Fixes read buffer overruns during "make change.ok".

Clears up several valgrind warnings of the form

Conditional jump or move depends on uninitialised value(s)
   at wine_dbgstr_wn (test.h:471)
   by test_readdirectorychanges_cr (test.h:66)
   by func_change (change.c:1103)
   by run_test (test.h:556)
   by main (test.h:624)
 Uninitialised value was created by a stack allocation
   at test_readdirectorychanges_cr (change.c:794)
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