Adjust bounds calculation in getUnoccupiedAdjacentCoords

Reduced track width and height by one to account for zero-based indexing in coordinate calculations. This change ensures accurate boundary checks and prevents potential out-of-bounds errors.

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

@@ -1061,8 +1061,9 @@ public static void deployForceToCoords(StratconCoords coords, int forceID, Campa
      */
     private static @Nullable StratconCoords getUnoccupiedAdjacentCoords(StratconCoords originCoords,
                                                                        StratconTrackState trackState) {
-        final int trackWidth = trackState.getWidth();
-        final int trackHeight = trackState.getHeight();
+        // We need to reduce width/height by one because coordinates index from 0, not 1
+        final int trackWidth = trackState.getWidth() - 1;
+        final int trackHeight = trackState.getHeight() - 1;
 
         List<StratconCoords> suitableCoords = new ArrayList<>();
         for (int direction : ALL_DIRECTIONS) {