fix: bypass by supplying whitespace or path argument (933120 PL-1) #3894
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This PR fixes a bypass introduced in #3863 to fix false positives with base64 encoded requests with double equals sign. This rule can be bypassed by either adding a white space, for example
memory_limit = 512Mor by supplying a pathextension_dir=/path/to/exampleto a directive. I've used a negated set to avoid false positive with a double equals sign while also fixing the bypass.