Fix failing InlineAnalyticsActions test
Fix failing InlineAnalyticsActions test

Previously, test to ensure ajax call to server would fail due to
format mismatch between actual and expected request body. Expected body
was an encoded `ajaxDataString`. The expected body is now a json string.

caesar2164/edx-platform,Stanford-Online/edx-platform,Stanford-Online/edx-platform,Stanford-Online/edx-platform,Stanford-Online/edx-platform,caesar2164/edx-platform,caesar2164/edx-platform,caesar2164/edx-platform