fix: hide the progress bar when start notices are off

Fixes #2

res/config/cachy-auto-update.conf

@@ -107,8 +107,8 @@ RemoveOrphans=no
 # password prompt that never mentions updates. The message is withdrawn again
 # when the result arrives, so it costs one bubble, not two.
 #
-# Separate from the progress bar in the notification area, which is not
-# optional and appears whenever the desktop supports one.
+# Also turns the progress bar in the notification area on or off. The desktop
+# pops it up as it opens, so it counts as a start notice too.
 NotifyOnStart=yes
 
 # Say something after a successful update. Nothing is ever shown when there