Remove unneeded dependency in Buck build
Remove unneeded dependency in Buck build

Commit f922c4 removed the usage of UrlValidator, hence the dependency
to commons:validator is not needed anymore.

Change-Id: I91322ba5552052eb6e98d1f6d63cff42435bfc7f
Signed-off-by: Edwin Kempin <b444e279ad95fdef4fbdd82c813b624595df204a@sap.com>

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