atually made use of the cache

src/main/java/org/forkalsrud/album/exif/DirectoryEntry.java

@@ -59,7 +59,7 @@ public class DirectoryEntry extends Entry {
             throw new RuntimeException("Use DirectoryEntry only for directories: " + file);
         }
         this.db = db;
-        cache = db.load(file.getAbsolutePath());
+        cache = db.get(file.getAbsolutePath());
         if (cache == null) {
             cache = new DirectoryProps();
         }