Fix for Issue MegaMek#7794 - Incorrect BV mod for IS BA Reactive Armor. (MegaMek#7801)

Root Cause: The isReactive(), isFireResistant(), and isReflective()
methods in BattleArmor.java were checking for misc equipment flags, but
BA special armor types are stored as armor types (via getArmorType()),
not as misc equipment. The old code never matched anything.

  Fix: Simplified all three methods to directly check the armor type:

```
  public boolean isFireResistant() {
      return getArmorType(LOC_TROOPER_1) == EquipmentType.T_ARMOR_BA_FIRE_RESIST;
  }

  public boolean isReflective() {
      return getArmorType(LOC_TROOPER_1) == EquipmentType.T_ARMOR_BA_REFLECTIVE;
  }

  public boolean isReactive() {
      return getArmorType(LOC_TROOPER_1) == EquipmentType.T_ARMOR_BA_REACTIVE;
  }

```
  File changed: megamek/src/megamek/common/battleArmor/BattleArmor.java
  
  Fixes MegaMek#7794

Author: IllianiBird

megamek/src/megamek/common/battleArmor/BattleArmor.java

@@ -1310,41 +1310,23 @@ public int getVibroClaws() {
 
     /**
      * return if this BA has fire-resistant armor
-     *
      */
     public boolean isFireResistant() {
-        for (Mounted<?> equip : getMisc()) {
-            if (equip.getType().hasFlag(MiscType.F_FIRE_RESISTANT)) {
-                return true;
-            }
-        }
-        return false;
+        return getArmorType(LOC_TROOPER_1) == EquipmentType.T_ARMOR_BA_FIRE_RESIST;
     }
 
     /**
      * return if this BA has laser reflective armor
-     *
      */
     public boolean isReflective() {
-        for (Mounted<?> equip : getMisc()) {
-            if (equip.getType().hasFlag(MiscType.F_REFLECTIVE)) {
-                return true;
-            }
-        }
-        return false;
+        return getArmorType(LOC_TROOPER_1) == EquipmentType.T_ARMOR_BA_REFLECTIVE;
     }
 
     /**
      * return if this BA has reactive armor
-     *
      */
     public boolean isReactive() {
-        for (Mounted<?> equip : getMisc()) {
-            if (equip.getType().hasFlag(MiscType.F_REACTIVE)) {
-                return true;
-            }
-        }
-        return false;
+        return getArmorType(LOC_TROOPER_1) == EquipmentType.T_ARMOR_BA_REACTIVE;
     }
 
     /**