Use standard ECM range for Watchdog/Nova CEWS

The current rules state that the Watchdog and Nova operate as standard
Clan-spec ECM Suites, meaning they have a range of six hexes.

megamek/src/megamek/common/Entity.java

@@ -5299,9 +5299,7 @@ public int getECMRange() {
                         && (this instanceof BattleArmor)) {
                         toReturn = 2;
                     }
-                    if (type.hasFlag(MiscType.F_EW_EQUIPMENT)
-                        || type.hasFlag(MiscType.F_NOVA)
-                        || type.hasFlag(MiscType.F_WATCHDOG)) {
+                    if (type.hasFlag(MiscType.F_EW_EQUIPMENT)) {
                         toReturn = 3;
                     }
                     if (game.getPlanetaryConditions().hasEMI()) {