user32/tests/dde.c: loosen timeout, fix allocation size

[Dan Kegel]

Under valgrind, tests run a bit slower, so the 200ms
timeout seems to be too short; I saw this error in this morning's run:
dde.c:391: Test failed:  Expected TRUE, got 0x474197d
This patch doubles the timeout (though perhaps it should be bigger still).

Also, one test buffer was sized two bytes too big, which
caused a valgrind warning about the last two bytes being
uninitialised:
 Syscall param writev(vector[1]) points to uninitialised byte(s)
 ...by  test_msg_client (dde.c:1072)
    by  func_dde (dde.c:2080)
  Address 0x7F00A6F8 is 16 bytes inside a block of size 18 alloc'd
 ...by  create_poke (dde.c:982)
    by  test_msg_client (dde.c:1062)
    by  func_dde (dde.c:2080)
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