Don't rethrow exceptions in parse_k8s_audit_json

Callers aren't expected to catch execeptions and instead rely on the
bool return value to indicate whether or not the parsing was successful.

Signed-off-by: Mark Stemm <mark.stemm@gmail.com>

userspace/engine/falco_engine.cpp

@@ -433,8 +433,6 @@ bool falco_engine::parse_k8s_audit_json(nlohmann::json &j, std::list<json_event>
 	}
 	catch(exception &e)
 	{
-		// Propagate the exception
-		rethrow_exception(current_exception());
 		return false;
 	}
 }