fix arabic postprocess bug

ppocr/postprocess/rec_postprocess.py

@@ -38,6 +38,10 @@ class BaseRecLabelDecode(object):
             if use_space_char:
                 self.character_str.append(" ")
             dict_character = list(self.character_str)
+            if 'arabic' in character_dict_path:
+                self.reverse = True
+            else:
+                self.reverse = False
 
         dict_character = self.add_special_char(dict_character)
         self.dict = {}
@@ -45,11 +49,6 @@ class BaseRecLabelDecode(object):
             self.dict[char] = i
         self.character = dict_character
 
-        if 'arabic' in character_dict_path:
-            self.reverse = True
-        else:
-            self.reverse = False
-
     def pred_reverse(self, pred):
         pred_re = []
         c_current = ''