fix parameter error (#1925)

### What problem does this PR solve?


### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

deepdoc/parser/txt_parser.py

@@ -15,7 +15,7 @@ from rag.nlp import find_codec,num_tokens_from_string
 import re
 
 class RAGFlowTxtParser:
-    def __call__(self, fnm, binary=None, chunk_token_num=128):
+    def __call__(self, fnm, binary=None, chunk_token_num=128, delimiter="\n!?;。；！？"):
         txt = ""
         if binary:
             encoding = find_codec(binary)
@@ -27,7 +27,7 @@ class RAGFlowTxtParser:
                     if not l:
                         break
                     txt += l
-        return self.parser_txt(txt, chunk_token_num)
+        return self.parser_txt(txt, chunk_token_num, delimiter)
 
     @classmethod
     def parser_txt(cls, txt, chunk_token_num=128, delimiter="\n!?;。；！？"):