Updated spec for issue #5112, codecogs images

Change-Id: Id50049594bf626077b63b10ea8c8ddfe104fd894
Reviewed-on: https://gerrit.instructure.com/5868
Reviewed-by: Ryan Shaw <ryan@instructure.com>
Tested-by: Hudson <hudson@instructure.com>

Author: Ryan Florence

spec/selenium/equation_spec.rb

@@ -35,7 +35,7 @@ def save_question_and_wait(question)
       equation_editor = find_with_jquery("#instructure_equation_prompt:visible")
       equation_editor.find_element(:css, 'button').click
       question.find_element(:link, "Switch Views").click
-      question.find_element(:css, 'textarea.question_content').attribute(:value).should include('<img class="equation_image" title="1+1" src="http://latex.codecogs.com/gif.latex?1+1" alt="1+1" />')
+      question.find_element(:css, 'textarea.question_content').attribute(:value).should include('<img class="equation_image" title="1+1" src="/equation_images/1%2B1" alt="1+1" />')
       save_question_and_wait(question)
 
       question.find_elements(:css, 'img.equation_image').size.should == 1