go.talks/present: fix tags nesting in slide.tmpl
Also chmod -x slide.tmpl.

Fixes golang/go#4289.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6779056
diff --git a/present/slide.tmpl b/present/slide.tmpl
old mode 100755
new mode 100644
index 62de725..2b720da
--- a/present/slide.tmpl
+++ b/present/slide.tmpl
@@ -43,7 +43,7 @@
   {{end}}{{/* of Slide block */}}
 
       <article>
-        <h3>Thank you</h1>
+        <h3>Thank you</h3>
         {{range .Presenters}}
           <div class="presenter">
             {{range .Elem}}{{.HTML $.Template}}{{end}}