Remove max_length on answer <textarea>, length is now arbitrary

mentoring/answer.py

@@ -75,7 +75,6 @@ class AnswerBlock(XBlock):
         if not self.read_only:
             html = render_template('templates/html/answer_editable.html', {
                 'self': self,
-                'max_length': Answer._meta.get_field('student_input').max_length,
             })
         else:
             html = render_template('templates/html/answer_read_only.html', {

templates/html/answer_editable.html

-<textarea cols="100" rows="10" maxlength="{{ max_length }}" name="input">{{ self.student_input }}</textarea>
+<textarea cols="100" rows="10" name="input">{{ self.student_input }}</textarea>