mediawiki: Switch to MediaWiki 2020 logo

Signed-off-by: Joseph Nuthalapati <njoseph@riseup.net>
[sunil: Added copyright year]
[sunil: Scaled the images to sizes commonly used for FreedomBox logos]
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>

debian/copyright

@@ -65,7 +65,6 @@ Files: static/themes/default/icons/diaspora.png
        static/themes/default/icons/ejabberd.png
        static/themes/default/icons/ejabberd.svg
        static/themes/default/icons/matrixsynapse.svg
-       static/themes/default/icons/mediawiki.svg
        static/themes/default/icons/privoxy.png
        static/themes/default/icons/privoxy.svg
        static/themes/default/icons/radicale.svg
@@ -82,7 +81,6 @@ Comment: Placed into public domain by authors (or)
          Do not meet the threshold of originality
          Tango Desktop Project
          https://commons.wikimedia.org/wiki/File:Ejabberd_icon.png
-         https://commons.wikimedia.org/wiki/File:MediaWiki-notext.svg
          https://radicale.org/css/logo.svg
          https://github.com/resiprocate/resiprocate/blob/master/resip/stack/doc/reSIProcate-logo.svg
 License: public-domain
@@ -137,6 +135,12 @@ Copyright: 2017 Kishan Raval
 Comment: https://github.com/thekishanraval/Logos
 License: GPL-3+
 
+Files: static/themes/default/icons/mediawiki.png
+       static/themes/default/icons/mediawiki.svg
+Copyright: 2020 Serhio Magpie
+Comment: https://commons.wikimedia.org/wiki/File:MediaWiki-2020-icon.svg
+License: CC-BY-SA-4.0
+
 Files: static/themes/default/icons/minetest.png
 Copyright: 2011 erlehmann
 License: CC-BY-SA-3.0