修复 AES-128 解密时错误地未使用指定的 IV (#823)

* Fix AES-128 IV parsing when same key URI is used with different IVs

* Make sure to re-parse the key if either KEY URL or IV changed

src/N_m3u8DL-RE.Parser/Extractor/HLSExtractor.cs

@@ -310,11 +310,8 @@ internal class HLSExtractor : IExtractor
             // 解析KEY
             else if (line.StartsWith(HLSTags.ext_x_key))
             {
-                var uri = ParserUtil.GetAttribute(line, "URI");
-                var uri_last = ParserUtil.GetAttribute(lastKeyLine, "URI");
-                    
-                // 如果KEY URL相同，不进行重复解析
-                if (uri != uri_last)
+                // 如果KEY line相同则不再重复解析
+                if (line != lastKeyLine)
                 {
                     // 调用处理器进行解析
                     var parsedInfo = ParseKey(line);