Revert "Get download dir in download mode only"

This reverts commit 241d9daae9.

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