shlwapi/tests: initialize size parameter in test_SHGetShellKey

[Dan Kegel]

The caller to SKGetValueW forgot to pass in a valid buffer size,
so valgrind complained:

Conditional jump or move depends on uninitialised value(s)
   at NtQueryValueKey (reg.c:524)
   by RegQueryValueExW (registry.c:1341)
   by SHQueryValueExW (reg.c:1415)
   by SKGetValueW (ordinal.c:4707)
   by test_SHGetShellKey (ordinal.c:2876)
   by func_ordinal (ordinal.c:2989)
   by run_test (test.h:556)
   by main (test.h:624)
 Uninitialised value was created by a stack allocation
   at test_SHGetShellKey (ordinal.c:2804)

Setting the size makes valgrind happy.
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