[YouTube] Allow lowercase global array names

Author: FineFindus

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

@@ -38,7 +38,7 @@ final class YoutubeSignatureUtils {
     private static final String DEOBF_FUNC_REGEX_END = "=function\\([a-zA-Z0-9_]+\\)\\{.+?\\})";
 
     // CHECKSTYLE:OFF
-    private static final String SIG_DEOBF_GLOBAL_ARRAY_REGEX = "(var [A-Z]='.*'.split\\(\";\"\\))";
+    private static final String SIG_DEOBF_GLOBAL_ARRAY_REGEX = "(var [A-z]=\".*\".split\\(\";\"\\))";
     private static final String SIG_DEOBF_HELPER_OBJ_NAME_REGEX = ";([A-Za-z0-9_\\$]{2,})\\[..";
     private static final String SIG_DEOBF_HELPER_OBJ_REGEX_START = "(var ";
     private static final String SIG_DEOBF_HELPER_OBJ_REGEX_END = "=\\{(?>.|\\n)+?\\}\\};)";