Fix: abnormal cell mergeing. (#6991)

### What problem does this PR solve?


### Type of change

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

deepdoc/vision/table_structure_recognizer.py

         return "Ot"
 
     @staticmethod
-    def construct_table(boxes, is_english=False, html=False, **kwargs):
+    def construct_table(boxes, is_english=False, html=True, **kwargs):
         cap = ""
         i = 0
         while i < len(boxes):

rag/app/manual.py

                         if c.text == r.cells[j].text:
                             span += 1
                             i = j
+                        else:
+                            break
                     i += 1
                     html += f"<td>{c.text}</td>" if span == 1 else f"<td colspan='{span}'>{c.text}</td>"
                 html += "</tr>"