Werk #11726: Error on windows agent update in case of a numerical agent hash

After an (automatic) windows agent update took place, the agent updater checks for a correct agent hash on the next call.

Previously, the check failed, if the new hash only contains numbers, with the acutal update being successful. As a result, the agent updater downloaded the agent periodically, while the Check_MK Agent service periodically changed to WARN with a last_error of inconsistent pending update.

With this Werk applied, the behavior will be fixed after the next agent baking and the succeeding agent update on the affected hosts.

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