Remove unnecessary extra definition of isSource

Author: egregius313

go/ql/test/library-tests/semmle/go/dataflow/flowsources/local/database/test.ql

@@ -5,10 +5,7 @@ import experimental.frameworks.CleverGo
 import utils.test.InlineFlowTest
 
 module Config implements DataFlow::ConfigSig {
-  predicate isSource(DataFlow::Node source) {
-    source instanceof ActiveThreatModelSource or
-    source.asExpr().(CallExpr).getCalleeName() = "source"
-  }
+  predicate isSource(DataFlow::Node source) { source instanceof ActiveThreatModelSource }
 
   predicate isSink(DataFlow::Node sink) {
     sink.asExpr() = any(CallExpr c | c.getTarget().getName() = "sink").getAnArgument()