Core/Auras: Implemented new proc ppm modifier - SPELL_PPM_MOD_AURA

Port From (https://github.com/TrinityCore/TrinityCore/commit/234dd5f26b045518f2f67cc434acc8b978607cd6)

Source/Framework/Constants/CliDBConst.cs

@@ -2199,7 +2199,8 @@ namespace Framework.Constants
         Spec = 4,
         Race = 5,
         ItemLevel = 6,
-        Battleground = 7
+        Battleground = 7,
+        Aura = 8
     }
 
     public enum SpellShapeshiftFormFlags

Source/Game/Spells/SpellInfo.cs

@@ -3089,6 +3089,12 @@ namespace Game.Spells
                             ppm *= 1.0f + mod.Coeff;
                         break;
                     }
+                    case SpellProcsPerMinuteModType.Battleground:
+                    {
+                        if (caster.HasAura(mod.Param))
+                            ppm *= 1.0f + mod.Coeff;
+                        break;
+                    }
                     default:
                         break;
                 }