Remove implementation of FileSize validator

app/extensions/wtforms_extras/validators.py

@@ -1,14 +0,0 @@
-from wtforms.validators import ValidationError
-
-
-def FileSize(max_size_mb):
-    max_size_b = max_size_mb * 1024 * 1024
-
-    def file_length_check(form, field):
-        if len(field.data.read()) >= max_size_b:
-            raise ValidationError(
-                f'File size must be less or equal than {max_size_mb} MB'
-            )
-        field.data.seek(0)
-
-    return file_length_check