fixed a typo breaking build cinnamon (#2936)

config/desktop/focal/environments/cinnamon/debian/postinst

@@ -38,7 +38,7 @@ theme='Numix'
 
 [org/cinnamon/settings-daemon/plugins/xsettings]
 buttons-have-icons=true
-menus-have-icons=true” >> $keys
+menus-have-icons=true" >> $keys
 
 echo "user-db:user
 system-db:local" >> $profile
@@ -48,6 +48,4 @@ dconf update
 #re-compile schemas
 if [ -d /usr/share/glib-2.0/schemas ]; then
 	glib-compile-schemas /usr/share/glib-2.0/schemas
-fi
-
-
+fi