chore: Remove InvalidMediaSequence error handling.

Invalid media sequence number error handling has been deemed unnecessary and thus removed from validation.rs and playlist/mod.rs. Other existing validation errors remain unaffected.

src/m3u8/playlist/mod.rs

@@ -531,9 +531,6 @@ impl Playlist {
             Tag::ExtXTargetDuration(duration) if *duration == 0 => {
                 errors.push(ValidationError::InvalidTargetDuration(*duration));
             }
-            Tag::ExtXMediaSequence(sequence) if *sequence == 0 => {
-                errors.push(ValidationError::InvalidMediaSequence(*sequence));
-            }
             Tag::ExtXKey { method, .. }
                 if !matches!(method.as_str(), "NONE" | "AES-128" | "SAMPLE-AES") =>
             {

src/m3u8/validation.rs

@@ -28,14 +28,7 @@ pub enum ValidationError {
     ///
     /// * `u32` - The invalid target duration value that was encountered.
     InvalidTargetDuration(u64),
-
-    /// Error indicating that the media sequence number specified is invalid.
-    ///
-    /// # Arguments
-    ///
-    /// * `u64` - The invalid media sequence number that was encountered.
-    InvalidMediaSequence(u64),
-
+
     /// Error indicating that an invalid key method was specified.
     ///
     /// # Arguments