Revert "Get download dir in download mode only"

This reverts commit 241d9daae9.

app/src/main/java/com/hippo/ehviewer/spider/SpiderDen.java

@@ -50,12 +50,13 @@ public final class SpiderDen {
     @Nullable
     private static SimpleDiskCache sCache;
     @Nullable
-    private UniFile mDownloadDir;
+    private final UniFile mDownloadDir;
     private final long mGid;
     private volatile int mMode = SpiderQueen.MODE_READ;
 
     public SpiderDen(GalleryInfo galleryInfo) {
         mGid = galleryInfo.gid;
+        mDownloadDir = getGalleryDownloadDir(galleryInfo);
     }
 
     public static void initialize(Context context) {
@@ -152,10 +153,6 @@ public final class SpiderDen {
         return mDownloadDir != null && mDownloadDir.isDirectory() ? mDownloadDir : null;
     }
 
-    public void setDownloadDir(UniFile dir) {
-        mDownloadDir = dir;
-    }
-
     private boolean containInCache(int index) {
         if (sCache == null) {
             return false;

app/src/main/java/com/hippo/ehviewer/spider/SpiderQueen.java

@@ -317,9 +317,6 @@ public final class SpiderQueen implements Runnable {
             mode = MODE_READ;
         }
 
-        if (mode == MODE_DOWNLOAD && mSpiderDen.getDownloadDir() == null) {
-            mSpiderDen.setDownloadDir(SpiderDen.getGalleryDownloadDir(mGalleryInfo));
-        }
         mSpiderDen.setMode(mode);
 
         // Update download page