Suggestion to fix muslim piety

[Thorfindel]

Goal: make Muslim republics viable by lowering loss of piety at ruler death. Goal 1: make Muslim DOWs interact more logically with peity by flipping piety loss/gain when you DOW (non-)Muslims.

Current state, found in defines.lua:

    PIETY_PERCENTAGE_AT_NEW_RULER = 0.25,           -- percentage of piety kept at new ruler.
    PIETY_INCREASE_AT_GOOD_WAR = 0.25,
    PIETY_DECREASE_AT_BAD_WAR = -0.33,

Suggestion to change to:

    PIETY_PERCENTAGE_AT_NEW_RULER = 080,            -- percentage of piety kept at new ruler.
    PIETY_INCREASE_AT_GOOD_WAR = -0.25,
    PIETY_DECREASE_AT_BAD_WAR = 0.25,

[vikingnephilim]

added by you!