wintab: Incorrectly classifying cursor as stylus instead of eraser

[Eriks Dobelis]

For Wacom Pen & Touch Intuos tablet eraser cursor is incorrectly 
detected as stylus.
The tablet returns its eraser cursor name as:
Wacom Intuos PT S Pen eraser
and type as:
ERASER

Current code classifies this as STYLUS, because name of the cursor 
contains the word 'Pen'. It is very unlikely that a cursor with type 
ERASER is STYLUS.

With the patch eraser is correctly detected. Without the patch eraser 
works as stylus.

  dlls/winex11.drv/wintab.c | 3 +++
  1 file changed, 3 insertions(+)