Minor changes

Address 4590 and 4462

Author: JorjMcKie

src/__init__.py

@@ -3931,7 +3931,7 @@ def delete_pages(self, *args, **kw):
             else:
                 r = args[0]
                 if type(r) is int:
-                    numbers = (r,)
+                    return self.delete_page(r)
                 else:
                     numbers = tuple(r)
 

src/utils.py

@@ -4369,7 +4369,7 @@ def remove_hidden(cont_lines):
         found_redacts = False
         for annot in page.annots():
             if annot.type[0] == mupdf.PDF_ANNOT_FILE_ATTACHMENT and attached_files:
-                annot.update_file(buffer=b" ")  # set file content to empty
+                annot.update_file(buffer_=b" ")  # set file content to empty
             if reset_responses:
                 annot.delete_responses()
             if annot.type[0] == pymupdf.PDF_ANNOT_REDACT:  # pylint: disable=no-member