drop sagemath desktop entry as it is merged into upstream

2020.1/aims-desktop/aims-desktop-2020/debian/changelog

+aims-desktop (2020.12) buster; urgency=medium
+
+  * Remove sage-aims desktop entry (merged into upstream)
+
+ -- Kyle Robbertze <kyle@aims.ac.za>  Fri, 25 Jan 2019 09:19:24 +0000
+
 aims-desktop (2020.11) buster; urgency=medium
 
   * Remove aims-install-r35

2020.1/aims-desktop/aims-desktop-2020/debian/install

@@ -13,6 +13,4 @@ conf/xterm/XTerm.QVT /etc/X11/app-defaults
 gnome-term.png usr/share/pixmaps
 jupyter-aims.desktop usr/share/applications
 jupyter-aims.png usr/share/pixmaps
-sagemath-aims.desktop usr/share/applications
-sagemath-aims.png usr/share/pixmaps
 su_financial.desktop usr/share/applications

2020.1/aims-desktop/aims-desktop-2020/sagemath-aims.desktop

-[Desktop Entry]
-Version=1.0
-Type=Application
-Terminal=true
-Exec=/usr/bin/sage -notebook
-Name=Sagemath 7.4
-GenericName=Open Source Mathematics Software
-Comment=Sagemath Open Source Mathematics Software
-Icon=sagemath-aims.png