Fix Python 3 bytes compatibility in ragtag_agp2fa.py

[mankiddyman]

Problem

When running ragtag.py scaffold with Python 3.6+, the process fails during FASTA generation with:
TypeError: a bytes-like object is required, not 'dict'

Root Cause

pysam.FastaFile.fetch() returns bytes in Python 3, but the code was trying to pass these bytes directly to reverse_complement() and sys.stdout.write(), which expect strings.

Solution

Added .decode('utf-8') to convert bytes to strings before processing in two locations in ragtag_agp2fa.py:

• Line 69: Before calling reverse_complement()
• Line 71: Before calling sys.stdout.write()

Testing

Tested with actual genomic data where the original code was failing. The fix resolves the issue and scaffolding completes successfully.

• pysam.FastaFile.fetch() returns bytes in Python 3
• Added .decode('utf-8') to convert bytes to string before processing
• Fixes TypeError when calling reverse_complement() and sys.stdout.write()
• Resolves issue where scaffolding fails during FASTA generation