fixed inventory not closing after deselect bug

src/Blaze-Brigade/Blaze_Brigade/MouseHandler.cs

@@ -65,6 +65,7 @@ namespace Controller
                 && validX && validY && (GameState.selectedUnit != null || GameState.selectedEnemyUnit != null))
             {
                 GameFunction.deselectUnit();
+                GameState.inventoryOpen = false;
             }
 
             // if no unit is selected when right-click, display end turn button