winebrowser: Interpret the DDE data as CHAR or WCHAR just like the shell32 dde_connect helper sends it

[Paul Chitescu]

Changelog:
	winebrowser: Interpret the DDE data as CHAR or WCHAR just like the shell32 
dde_connect helper sends it.

Shell32 sends either 8 bit or 16 bit strings in XTYP_EXECUTE depending on the 
highest bit of "operating system version" - ASCII based or Unicode based. 
When the data is used in winebrowser it must be interpreted the same.
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