Rogue & druid finishers incorrectly state max_combopoints=4

[johnnylam88]

Rogue & druid finishers incorrectly state max_combopoints=4 when it
should be max_combopoints=5, although rogue finishers can also use up
to 6 combopoints if Deeper Strategem is talented.

There are two issues:

1. The script that imports the spell database may need to be adjusted
   to output the correct value for max_combopoints.
2. This may alternatively be addressed by fix(power): fix semantics of {max,set,refund}_XXX in SpellInfo() #835
   by removing all of the max_combopoints properties and instead just
   adding set_combopoints=0. Using this style will avoid needing to
   know what exactly is the maximum number of combopoints that can be
   spent.