Fix type error

Fixing error:
File "/usr/src/app/helpers/main_helper.py", line 272, in reformat
    maximum_length = maximum_length - int(directory_count+path_count+extra_count)
TypeError: unsupported operand type(s) for -: 'str' and 'int'

Seems like prepared_format.maximum_length is a string.

helpers/main_helper.py

@@ -235,7 +235,7 @@ def reformat(prepared_format, unformatted):
     date = prepared_format.date
     text = prepared_format.text
     value = "Free"
-    maximum_length = prepared_format.maximum_length
+    maximum_length = int(prepared_format.maximum_length)
     post_id = "" if post_id is None else str(post_id)
     media_id = "" if media_id is None else str(media_id)
     extra_count = 0