Commits on Jan 17, 2019

1. Fix issue with multiple ubcpi xblocks in same unit …

   - fix the issue that if there are multiple ubcpi in the same unit,
   clicking on an answer text will jump to the top of the page and the
   answer is not selected
   
   - fix the issue that when the subsection has multiple units with ubcpi,
   clicking on submit button will jump to the top of the page
   
   - fix the issue that when the student finished Step 1 and switch to
   another unit and back, persisted data is not displayed and Step 1 is
   dispalyed again

   

   kitsook committed Jan 17, 2019
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