comctl32: Remove trailing spaces in propsheet.c

[James McKenzie]

Ričardas Barkauskas wrote:
> Remove trailing spaces in comctl32's propsheet.c.
>
>   
These types of patches are highly discouraged unless this is causing a
breakage with your compiler.

If there is a breakage, file a bug with this patch attached for comments.

Trailing spaces are not a problem with most forms of GNU c/C++ (gcc/g++)

James McKenzie