Move some GNOME apps to different menu categories (refs: #16981)

This moves Calculator to Accessories and Terminal to System Tools,
by deleting the respective Include and Exclude lines in
/etc/xdg/menus/gnome-applications.menu.

config/chroot_local-patches/tweak-gnome-applications-menu.diff

+--- /etc/xdg/menus/gnome-applications.menu 2019-08-26 23:17:27.532000000 +0000
++++ /etc/xdg/menus/gnome-applications.menu	2019-08-26 23:18:41.156000000 +0000
+@@ -35,7 +35,6 @@
+            Please keep the list alphabetically sorted! -->
+       <Filename>eog.desktop</Filename>
+       <Filename>gucharmap.desktop</Filename>
+-      <Filename>org.gnome.Calculator.desktop</Filename>
+       <Filename>org.gnome.DejaDup.desktop</Filename>
+       <Filename>org.gnome.Dictionary.desktop</Filename>
+       <Filename>org.gnome.DiskUtility.desktop</Filename>
+@@ -295,7 +294,6 @@
+       <Filename>gnome-system-log.desktop</Filename>
+       <Filename>gnome-system-monitor.desktop</Filename>
+       <Filename>org.gnome.baobab.desktop</Filename>
+-      <Filename>org.gnome.Terminal.desktop</Filename>
+     </Exclude>
+
+     <Menu>
+@@ -414,7 +412,6 @@
+       <Filename>gnome-system-monitor.desktop</Filename>
+       <Filename>gucharmap.desktop</Filename>
+       <Filename>org.gnome.baobab.desktop</Filename>
+-      <Filename>org.gnome.Calculator.desktop</Filename>
+       <Filename>org.gnome.DejaDup.desktop</Filename>
+       <Filename>org.gnome.Dictionary.desktop</Filename>
+       <Filename>org.gnome.DiskUtility.desktop</Filename>
+@@ -422,7 +419,6 @@
+       <Filename>org.gnome.FileRoller.desktop</Filename>
+       <Filename>org.gnome.fonts.desktop</Filename>
+       <Filename>org.gnome.Screenshot.desktop</Filename>
+-      <Filename>org.gnome.Terminal.desktop</Filename>
+       <Filename>org.gnome.tweaks.desktop</Filename>
+       <Filename>seahorse.desktop</Filename>
+       <Filename>vinagre.desktop</Filename>