Flag Explosive Shot as a negative spell effect. Closes #21922. (#22045)

src/server/game/Spells/SpellInfo.cpp

@@ -3439,6 +3439,9 @@ bool _isPositiveEffectImpl(SpellInfo const* spellInfo, uint8 effIndex, std::unor
             // Aspect of the Viper
             if (spellInfo->Id == 34074)
                 return true;
+            // Explosive Shot
+            if (spellInfo->SpellFamilyFlags[1] == SPELLFAMILYFLAG1_HUNTER_EXPLOSIVE_SHOT)
+                return false;
             break;
         case SPELLFAMILY_DRUID:
             // Starfall

src/server/game/Spells/SpellMgr.h

@@ -73,6 +73,9 @@ enum SpellFamilyFlag
     // Warlock
     SPELLFAMILYFLAG_WARLOCK_LIFETAP         = 0x00040000,
 
+    // Hunter
+    SPELLFAMILYFLAG1_HUNTER_EXPLOSIVE_SHOT  = 0x80000000,
+
     // Druid
     SPELLFAMILYFLAG2_DRUID_STARFALL         = 0x00000100,