change how armor break gp is handled

it's now universally .3s (except normal where it will be .4s) on all difficulties
instead of having .2s added on top of the already existing timer

lua/playerdamage.lua

@@ -266,7 +266,7 @@ function PlayerDamage:_calc_armor_damage(attack_data)
 			end
 
 			-- Add significantly longer grace period on armor break (repurposing Anarchist/Armorer damage timer) (sh)
-			self._can_take_dmg_timer = self._dmg_interval + 0.2
+			self._can_take_dmg_timer = math.max(self._dmg_interval, 0.3)
 
 			local pm = managers.player