Rm unused event attrs

[stopfstedt]

stefan@nichtsnutz: ~/dev/projects/frontend on master[$]
$ egrep -r 'postrequisite(Name|Slug)' packages --exclude-dir=dist --exclude-dir=node_modules                                                                                                         
packages/test-app/tests/classes/event-test.js:    assert.strictEqual(event.prerequisites[0].postrequisiteName, 'event 0');
packages/test-app/tests/classes/event-test.js:    assert.strictEqual(event.prerequisites[0].postrequisiteSlug, event.slug);
packages/test-app/tests/classes/event-test.js:    assert.strictEqual(event.prerequisites[1].postrequisiteName, 'event 0');
packages/test-app/tests/classes/event-test.js:    assert.strictEqual(event.prerequisites[1].postrequisiteSlug, event.slug);
packages/ilios-common/addon/classes/event.js:              postrequisiteName: this.name,
packages/ilios-common/addon/classes/event.js:              postrequisiteSlug: this.slug

begone!

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[michaelchadwick]

👍