Revert "Remove redundant initialization"

This reverts commit ea00238.

It's not so bad to make it explicit which value we are initializing fields to; @ Stypox's fault for not noticing during review ;-)

Author: Stypox

extractor/src/main/java/org/schabi/newpipe/extractor/stream/StreamInfo.java

@@ -352,7 +352,7 @@ private static void extractOptionalData(final StreamInfo streamInfo,
     private String uploaderUrl = "";
     @Nonnull
     private List<Image> uploaderAvatars = List.of();
-    private boolean uploaderVerified;
+    private boolean uploaderVerified = false;
     private long uploaderSubscriberCount = -1;
 
     private String subChannelName = "";
@@ -368,19 +368,19 @@ private static void extractOptionalData(final StreamInfo streamInfo,
     private String hlsUrl = "";
     private List<InfoItem> relatedItems = List.of();
 
-    private long startPosition;
+    private long startPosition = 0;
     private List<SubtitlesStream> subtitles = List.of();
 
     private String host = "";
     private StreamExtractor.Privacy privacy;
     private String category = "";
     private String licence = "";
     private String supportInfo = "";
-    private Locale language;
+    private Locale language = null;
     private List<String> tags = List.of();
     private List<StreamSegment> streamSegments = List.of();
     private List<MetaInfo> metaInfo = List.of();
-    private boolean shortFormContent;
+    private boolean shortFormContent = false;
 
     /**
      * Preview frames, e.g. for the storyboard / seekbar thumbnail preview