Use constant instead of magic value

Author: TBlueF

core/src/main/java/de/bluecolored/bluemap/core/map/hires/ArrayTileModel.java

@@ -53,7 +53,7 @@ else if (model.lastCapacityUse.plus(SHRINK_TIME).isBefore(now))
                 model.clear();
                 return model;
             },
-            Duration.ofMinutes(1)
+            SHRINK_TIME
     );
 
     // attributes         per-vertex * per-face