shell32: Don't append a trailing space to the arguments in a shell link if the command info has an empty parameters string.

[Ken Thomases]

This fixes a problem with starting the shortcuts installed for the RuneScape
launcher available from <http://www.runescape.com/downloads/runescape.msi?291113>.
They have an argument ("runescape").  Shell32 was adding a space, which caused
the program to fail to understand it.
---
dlls/shell32/shelllink.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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