change test files that do not end in .txt to view via GitHub

2019/karns/.entry.json

@@ -38,7 +38,7 @@
 	    "inventory_order" : 100,
 	    "OK_to_edit" : true,
 	    "display_as" : "text",
-	    "display_via_github" : false,
+	    "display_via_github" : true,
 	    "entry_text" : "input maze map"
 	},
 	{

2019/karns/index.html

@@ -230,7 +230,7 @@ not encountered this myself).</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/karns/prog.c">prog.c</a> - entry source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/karns/Makefile">Makefile</a> - entry Makefile</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/karns/prog.orig.c">prog.orig.c</a> - original source</li>
-<li><a href="maze">maze</a> - input maze map</li>
+<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/karns/maze">maze</a> - input maze map</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/karns/try.sh">try.sh</a> - how to run</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>