Revert "Reworded css_text to use css_find"

This reverts commit a7de337fe2d218d6cb9c2f175c6ea71f5ddcb6da.

common/djangoapps/terrain/ui_helpers.py

@@ -191,7 +191,7 @@ def css_text(css_selector, index=0, max_attempts=5):
         attempt = 0
         while attempt < max_attempts:
             try:
-                return world.css_find(css_selector, index=index).text
+                return world.browser.find_by_css(css_selector)[index].text
                 break
             except:
                 attempt += 1