修复无法正确识别模组的问题 (#5149)

HMCLCore/src/main/java/org/jackhuang/hmcl/util/tree/ArchiveFileTree.java

@@ -69,11 +69,8 @@ public abstract class ArchiveFileTree<R, E extends ArchiveEntry> implements Clos
 
     public @Nullable E getEntry(@NotNull String entryPath) {
         Dir<E> dir = root;
-        String fileName;
         if (entryPath.indexOf('/') < 0) {
-            fileName = entryPath;
-            if (fileName.isEmpty())
-                return root.getEntry();
+            return dir.getFiles().get(entryPath);
         } else {
             String[] path = entryPath.split("/");
             if (path.length == 0)
@@ -88,14 +85,9 @@ public abstract class ArchiveFileTree<R, E extends ArchiveEntry> implements Clos
                     return null;
             }
 
-            fileName = path[path.length - 1];
-            E entry = dir.getFiles().get(fileName);
-            if (entry != null)
-                return entry;
+            String fileName = path[path.length - 1];
+            return dir.getFiles().get(fileName);
         }
-
-        Dir<E> subDir = dir.getSubDirs().get(fileName);
-        return subDir != null ? subDir.getEntry() : null;
     }
 
     protected void addEntry(E entry) throws IOException {