Change where we check if force is combat flagged

With some help and use of debugger, we found the bit where it steps through each force to check the flag.

I've tested this with the debugger and it looks to work in a test campaign but needs solid testing.

MekHQ/src/mekhq/campaign/stratcon/StratconRulesManager.java

@@ -1087,6 +1087,7 @@ public static List<Integer> getAvailableForceIDs(Campaign campaign) {
                 .mapToInt(key -> key)
                 .mapToObj(campaign::getForce).filter(force -> (force != null)
                         && !force.isDeployed()
+                        && force.isCombatForce()
                         && !forcesInTracks.contains(force.getId()))
                 .map(Force::getId)
                 .collect(Collectors.toList());
@@ -1125,16 +1126,6 @@ public static List<Integer> getAvailableForceIDs(int unitType, Campaign campaign
                 continue;
             }
 
-            //checks if force is flagged as combat in TOE
-            if (!force.isCombatForce()) {
-                continue;
-            }
-
-            //checks if force is not top level (suggested by Illiani)
-            if (force.getFormationLevel().getDepth() != 0) {
-                continue;
-            }
-
             int primaryUnitType = force.getPrimaryUnitType(campaign);
             boolean noReinforcementRestriction = !reinforcements || (reinforcements
                     && (getReinforcementType(force.getId(), currentTrack, campaign,