Fix alert message

Author: egregius313

java/ql/src/Security/CWE/CWE-078/ExecTaintedEnvironment.ql

@@ -17,5 +17,4 @@ import ExecTaintedEnvironmentFlow::PathGraph
 
 from ExecTaintedEnvironmentFlow::PathNode source, ExecTaintedEnvironmentFlow::PathNode sink
 where ExecTaintedEnvironmentFlow::flowPath(source, sink)
-select sink.getNode(), source, sink, "This command will be execute with a tainted $@.",
-  sink.getNode(), "environment variable"
+select sink.getNode(), source, sink, "This command will be execute with a tainted environment variable."