Fix mispelled include parameter

closes FALCOR-204

Test Plan:
  - Load up a context card
  - It should have metrics table and last login data

Change-Id: I1539040b63b9b043949a209f00ea629db735d65f
Reviewed-on: https://gerrit.instructure.com/108831
Reviewed-by: Steven Burnett <sburnett@instructure.com>
Tested-by: Jenkins
QA-Review: Dan Sasaki <dsasaki@instructure.com>
Product-Review: Clay Diffrient <cdiffrient@instructure.com>

app/jsx/context_cards/StudentCardStore.js

@@ -53,7 +53,7 @@ import axios from 'axios'
     loadUser (studentId, courseId) {
       const includes = [
         'avatar_url',
-        'enrollements',
+        'enrollments',
         'inactive_enrollments',
         'current_grading_period_scores'
       ];