[YouTube] add new signature regex

Adds a new regex to find the signature deobfuscation function, which
works for the new `20830619` player.

Closes: #1287
Ref: #1287 (comment)

Author: FineFindus

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeSignatureUtils.java

@@ -24,6 +24,7 @@ final class YoutubeSignatureUtils {
 
     private static final Pattern[] FUNCTION_REGEXES = {
             // CHECKSTYLE:OFF
+            Pattern.compile("\\b(?:[a-zA-Z0-9_$]+)&&\\((?:[a-zA-Z0-9_$]+)=([a-zA-Z0-9_$]{2,})\\(decodeURIComponent\\((?:[a-zA-Z0-9_$]+)\\)\\)"),
             Pattern.compile("\\bm=([a-zA-Z0-9$]{2,})\\(decodeURIComponent\\(h\\.s\\)\\)"),
             Pattern.compile("\\bc&&\\(c=([a-zA-Z0-9$]{2,})\\(decodeURIComponent\\(c\\)\\)"),
             Pattern.compile("(?:\\b|[^a-zA-Z0-9$])([a-zA-Z0-9$]{2,})\\s*=\\s*function\\(\\s*a\\s*\\)\\s*\\{\\s*a\\s*=\\s*a\\.split\\(\\s*\"\"\\s*\\)"),