Drop the xfce4-panel hook, no longer needed.

Unit 193requested to merge
(removed):master into master

This hook was useful as the panel had a welcome screen on first launch that would ask if you want a blank panel or system defaults.

In the 4.15 series (later to become 4.16 stable release) it was removed so this hook is no longer useful, but can still cause problems.

See xfce4-panel commit: 44164c17f43a620085424027edcb8a751e3ed97e

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