Update index.html

Both PUT and DELETE forms had the same id "testForm2", and DELETE form didn't work because of that; I changed it to "testForm3", now everything works like it's supposed to.

views/index.html

@@ -59,7 +59,7 @@
         <button type="submit">Submit Issue</button>
       </form><br>
       <h3>Delete issue on <i>apitest</i></h3>
-      <form id="testForm2" class="border">
+      <form id="testForm3" class="border">
         <input type="text" name="_id" placeholder="_id" style="width: 100px" required=''><br>
         <button type="submit">Delete Issue</button>
       </form>