Updated appdata screenshot urls

Author: antenore

remmina/desktop/appdata.xml

@@ -69,11 +69,11 @@
   <screenshots>
     <screenshot type="default">https://freerdp.github.io/Remmina/images/appdata/main-en.png</screenshot>
     <screenshot type="default" xml:lang="it">https://freerdp.github.io/Remmina/images/appdata/main-it.png</screenshot>
-    <screenshot>https://freerdp.github.io/Remmina/images/appdata/protocol-rdp.png</screenshot>
-    <screenshot>https://freerdp.github.io/Remmina/images/appdata/protocol-vnc.png</screenshot>
-    <screenshot>https://freerdp.github.io/Remmina/images/appdata/protocol-ssh.png</screenshot>
-    <screenshot>https://freerdp.github.io/Remmina/images/appdata/protocol-sftp.png</screenshot>
-    <screenshot>https://freerdp.github.io/Remmina/images/appdata/protocol-xdmcp.png</screenshot>
+    <screenshot>https://www.remmina.org/images/appdata/protocol-rdp.png</screenshot>
+    <screenshot>https://www.remmina.org/images/appdata/protocol-vnc.png</screenshot>
+    <screenshot>https://www.remmina.org/images/appdata/protocol-ssh.png</screenshot>
+    <screenshot>https://www.remmina.org/images/appdata/protocol-sftp.png</screenshot>
+    <screenshot>https://www.remmina.org/images/appdata/protocol-xdmcp.png</screenshot>
   </screenshots>
   <url type="homepage">https://www.remmina.org/</url>
   <url type="bugtracker">https://github.com/FreeRDP/Remmina/issues</url>