[gnome-internet-radio-locator] Fix filename extension for screenshot

[Ole Aamot <ole src gnome org>]

commit 68ee91f48d4fba2ade2ea5cf9f24cdb2bdac7e6c
Author: Ole Aamot <ole gnome org>
Date:   Mon Oct 7 15:12:10 2019 +0200

    Fix filename extension for screenshot

 talk/GC2019.tex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/talk/GC2019.tex b/talk/GC2019.tex
index aea3d6a..2175aec 100644
--- a/talk/GC2019.tex
+++ b/talk/GC2019.tex
@@ -395,7 +395,7 @@ The audio codecs in GStreamer among the supported 111 radio stations are:
 
 \begin{center}
 
-  \colorbox{white}{\includegraphics[width=0.6\hsize]{../data/screenshot.jpg}}
+  \colorbox{white}{\includegraphics[width=0.6\hsize]{../data/screenshot.png}}
 
   {\blueem Screenshot of gnome-internet-radio-locator 2.0.7}