improve display_via_github and display_as values

Fixed some inconsistent use of display_via_github and display_as values.

1989/jar.2/index.html

@@ -252,7 +252,7 @@ poor performance!</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1989/jar.2/chocolate_cake.lisp">chocolate_cake.lisp</a> - input file</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1989/jar.2/fib.lisp">fib.lisp</a> - input file</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1989/jar.2/try.sh">try.sh</a> - how to run</li>
-<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1989/jar.2/try.txt">try.txt</a> - input file</li>
+<li><a href="try.txt">try.txt</a> - input file</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>