Remove InitSpells() (#1983)

InitSpells() is never called, and even if it were to be, it would do
nothing but call InitAvailableSpells().

src/factory/PlayerbotFactory.cpp

@@ -1103,8 +1103,6 @@ void PlayerbotFactory::ResetQuests()
     }
 }
 
-void PlayerbotFactory::InitSpells() { InitAvailableSpells(); }
-
 void PlayerbotFactory::InitTalentsTree(bool increment /*false*/, bool use_template /*true*/, bool reset /*false*/)
 {
     uint32 specTab;

src/factory/PlayerbotFactory.h

@@ -95,7 +95,6 @@ private:
     void InitTradeSkills();
     void UpdateTradeSkills();
     void SetRandomSkill(uint16 id);
-    void InitSpells();
     void ClearSpells();
     void ClearSkills();
     void InitTalents(uint32 specNo);