Fix off-by-one error on expansion rate

11/11_common.ts

@@ -10,7 +10,7 @@ export class StarMap {
 
     constructor(rawMap: string[], expansionRate = 1) {
         this.originalMap = rawMap;
-        this.expansionRate = expansionRate
+        this.expansionRate = expansionRate > 1 ? expansionRate - 1 : expansionRate;
         this.mapDimensions = {
             width: this.originalMap[0].length,
             height: this.originalMap.length