Java: Revert definition of isNeutral

Reverts the change made in
daf2743

With the change in the aforementioned commit, we were extracting candidates for endpoints that
had a neutral _summary_ model. These are bad candidates, as they have already been triaged.

Author: tausbn

java/ql/src/Telemetry/AutomodelApplicationModeCharacteristics.qll

@@ -79,7 +79,7 @@ module ApplicationCandidatesImpl implements SharedCharacteristics::CandidateSig
   predicate isNeutral(Endpoint e) {
     exists(string package, string type, string name, string signature |
       sinkSpec(e, package, type, name, signature, _, _) and
-      ExternalFlow::neutralModel(package, type, name, [signature, ""], "sink", _)
+      ExternalFlow::neutralModel(package, type, name, [signature, ""], _, _)
     )
   }
 

java/ql/src/Telemetry/AutomodelFrameworkModeCharacteristics.qll

@@ -60,7 +60,7 @@ module FrameworkCandidatesImpl implements SharedCharacteristics::CandidateSig {
   predicate isNeutral(Endpoint e) {
     exists(string package, string type, string name, string signature |
       sinkSpec(e, package, type, name, signature, _, _) and
-      ExternalFlow::neutralModel(package, type, name, [signature, ""], "sink", _)
+      ExternalFlow::neutralModel(package, type, name, [signature, ""], _, _)
     )
   }