[8.x](backport #40751) libbeat/processors/replace: fix zero string replacement validation #40801
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Proposed commit message
The change in #40047 breaks the use of the replace processor to do
s/<pattern>//
replacement. So make the validation on absence, not zero state.Checklist
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orCHANGELOG-developer.next.asciidoc
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This is an automatic backport of pull request #40751 done by [Mergify](https://mergify.com).