autoshift: disable autoshifting in some cases

Don't cancel druid form when clicking on npcs while in combat.
The "Can't speak while shapeshifted" will no longer put you out
of your druid forms while being in combat. This is especially
for bear tanks who better not lose their form while friendly NPCs
are nearby.

modules/autoshift.lua

@@ -91,6 +91,11 @@ pfUI:RegisterModule("autoshift", "vanilla", function ()
       -- scan through buffs and cancel shapeshift/mount
       for id, errorstring in pairs(pfUI.autoshift.errors) do
         if arg1 == errorstring then
+          -- dont's cancel form when clicking on npcs while in combat
+          if arg1 == ERR_CANT_INTERACT_SHAPESHIFTED and UnitAffectingCombat("player") then
+            return
+          end
+
           for i=0,31,1 do
             -- detect mounts based on tooltip text
             pfUI.autoshift.scanner:SetPlayerBuff(i)