Previously when there were 5 or more menu items in a pie menu
the acceptable angle to select an item was limited to 45 degrees.
This makes sense when all 8 menu items are set, however it unnecessarily
restricts the range for menu items that don't have adjacent items.
Resolve using a 90 degree angle range then checking of the adjacent
buttons exist and are a better match.
This also resolves a very small dead-zone between adjacent buttons
for both 4 or 8 button pie menus. It was possible for a direction to
select neither. Compare the direction enum as a tie breaker.
Ref !112311.
a8db828618