Changed frequency default value tfrom n/a to 360

[GuilhermeRameh]

Contribution

Description

Resolves #7805 , changing the wrong defalut value to 'frequency', previously n/a, now corrected to 360.

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[GuilhermeRameh]

Hi, i was able to test in my own Wazuh instance, and it seems that, if the label is left empty, the default is 360 seconds, as shown by the following image:

Data: First alert @ 14:32:28.001
Second alert @ 14:38:52.420
Diff: 00:06:24.419

Hope this helps!