Fix typo causing destinations using '/FitR' to fail

This PR fixes two typos which prevent destinations using '/FitR' from working, i.e. nothing happens when such a link is clicked.
An example of such a file is: https://www.eff.org/sites/default/files/filenode/DMCA/NTIA%20DMCA%20White%20Paper.pdf.
Using the latest version of pdf.js, notice how nothing happens when clicking on the links in the outline.