fix(ts): Skip broken PES packets instead of terminating file processing

Fixes #1455

When read_video_pes_header() encounters a malformed or truncated PES
packet (returns -1), copy_capbuf_demux_data() previously returned
CCX_EOF which terminated the entire file processing. This was overly
aggressive - a single broken PES packet should be skipped, not
terminate the entire file.

UK Freeview DVB recordings from September 2022 onwards contain some
malformed PES packets in the DVB subtitle stream that triggered this
condition, causing ccextractor to stop at 0% with "Processing ended
prematurely" error even though VLC could display the subtitles.

The fix changes the error handling to skip the broken packet and
continue processing:
- Before: return CCX_EOF (terminates file)
- After: return CCX_OK (skips packet, continues)

Test results with UK Freeview sample:
- Before: 0% processed, 0 subtitles extracted
- After: 100% processed, 10 subtitles extracted correctly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: cfsmp3

src/lib_ccx/ts_functions.c

@@ -589,8 +589,11 @@ int copy_capbuf_demux_data(struct ccx_demuxer *ctx, struct demuxer_data **data,
 	}
 	if (vpesdatalen < 0)
 	{
-		dbg_print(CCX_DMT_VERBOSE, "Seems to be a broken PES. Terminating file handling.\n");
-		return CCX_EOF;
+		// Don't terminate file processing for a single broken PES packet.
+		// Just skip this packet and continue with the next one.
+		// This commonly occurs in UK Freeview DVB recordings.
+		dbg_print(CCX_DMT_VERBOSE, "Skipping broken PES packet (buffer too small or malformed header).\n");
+		return CCX_OK;
 	}
 
 	if (ccx_options.hauppauge_mode)