[packagekit] outdated tooltips

[Matthias Clasen]

When does pk-update-icon update its tooltip ?

I had it tell me that there are 45 updates.
Then I ran yum update on the cmdline (since I expected to have to
manually exclude things).
The pk-update-icon statusicon did not change, and still told me that
there are 45 updates.
Then I opened pk-update-viewer, which found 3 new updates.
And the statusicon tooltip still told there are 45.