newmm has problem about " ์ "

[wannaphong]

Description

I try to tokenize text with "ทดสอบตัดคำภาษาไทยจอก์น".

Expected results

['ทดสอบ', 'ตัด', 'คำ', 'ภาษาไทย', 'จอก์', 'น']

Current results

['ทดสอบ', 'ตัด', 'คำ', 'ภาษาไทย', 'จอก', '์น']

Steps to reproduce

from pythainlp.tokenize import word_tokenize
word_tokenize("ทดสอบตัดคำภาษาไทยจอก์น")

Your environment

• PyThaiNLP version: 3.0.5
• Python version: 3.8
• Operating system and version (distro, 32/64-bit): Linux 64 bit
• More info (Docker, VM, etc.): Ubuntu 20.04 Docker