msi: tests/source.c: initialize buffer lengths before calling MsiSourceListEnumMediaDisks

[Dan Kegel]

Those pesky in/out buffer length parameters...
Leaving the length uninitialized could result in
a short string returned, or possibly a buffer overflow,
but will definitely make Valgrind object.

Fixes lots of errors like:

Conditional jump or move depends on uninitialised value(s)
   at RtlAllocateHeap (heap.c:1194)
   by msi_alloc (msipriv.h:945)
   by MsiSourceListEnumMediaDisksA (source.c:171)
   by test_MsiSourceListEnumMediaDisks (source.c:2322)
   by func_source (source.c:3309)
 Uninitialised value was created by a stack allocation
   at test_MsiSourceListEnumMediaDisks (source.c:2291)
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