[duplicated subtitle] Initialize subtitle cache directory for SubtitleDeduplicator

- Configure cache directory as `/storage/emulated/0/Android/data/<package_name>/cache/subtitle_cache`, otherwise it will be 'null', and subtitle deduplication will be skipped.
- Ensures this initialization is called before `checkAndDeduplicate()` in `SubtitleDeduplicator.java` (NewPipeExtractor).

Author: TransZAllen

app/src/main/java/org/schabi/newpipe/util/StateSaver.java

@@ -31,6 +31,7 @@
 
 import org.schabi.newpipe.BuildConfig;
 import org.schabi.newpipe.MainActivity;
+import org.schabi.newpipe.extractor.utils.SubtitleDeduplicator;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -70,6 +71,8 @@ public static void init(final Context context) {
         if (TextUtils.isEmpty(cacheDirPath)) {
             cacheDirPath = context.getCacheDir().getAbsolutePath();
         }
+
+        SubtitleDeduplicator.setCacheDirPath(cacheDirPath);
     }
 
     /**