Prevent the pleroma logo from getting overwritten during upgrades

src/freedombone-utils-gnusocialtools

     # customise the logo
     if [ -f $basedir/static/logo.png ]; then
         if [ -f ~/freedombone/img/logo_fbone3.png ]; then
-            cp ~/freedombone/img/logo_fbone3.png $basedir/static/logo.png
+            cp ~/freedombone/img/logo_fbone3.png $basedir/static/logo_custom.png
+            sed -i "s|\"logo\":.*|\"logo\": \"/static/logo_custom.png\",|g" $basedir/static/config.json
         else
             if [ -f /home/$MY_USERNAME/freedombone/img/logo_fbone3.png ]; then
-                cp /home/$MY_USERNAME/freedombone/img/logo_fbone3.png $basedir/static/logo.png
+                cp /home/$MY_USERNAME/freedombone/img/logo_fbone3.png $basedir/static/logo_custom.png
+                sed -i "s|\"logo\":.*|\"logo\": \"/static/logo_custom.png\",|g" $basedir/static/config.json
             fi
         fi
     fi