wineconsole: Handle mouse wheel scrolling for user backend.

[Dylan Smith]

The mouse wheel will scroll if the buffer height is greater than the
console window's height in lines, otherwise console mouse input events
are generated.

I used a fallthrough for the WM_MOUSEWHEEL to use the WM_VSCROLL code,
and needed to add a missing break at the end of the WM_VSCROLL case.
---
 programs/wineconsole/user.c |   38 ++++++++++++++++++++++++++------------
 1 files changed, 26 insertions(+), 12 deletions(-)
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