Fix pylint errors in edx-ora2

Here is the line that was updated: https://github.com/edx/edx-ora2/blob/9527bea876d46110158d19346a9422a5056531f8/scripts/run-pylint.sh#L9

This is a known error caused by the upgrade to pylint-django 2.4.2. The error looks like [E5110(django-not-configured), ] Django was not configured. For more information runpylint --load-plugins=pylint_django --help-msg=django-not-configured

In order to fix this, an additional option django-settings-module should be added to the pylint command, so that the command looks something like pylint --django-settings-module=<name.of.module> --rcfile=pylintrc designer *.py