Fix callPackage still producing dynamic exes

This was due to `staticHaskellBinariesOverlay` overlay changing every
_existing_ package to build statically, but not every _new_ package
called with `callPackage`.

Author: FPtje

survey/default.nix

@@ -1709,11 +1709,11 @@ let
                  ])
                ]);
         in
-          final.lib.mapAttrs
-            (name: value:
-              if (isProperHaskellPackage value && isExecutable value) then statify value else value
-            )
-            super
+          {
+            callPackage = path: args:
+              let value = super.callPackage path args; in
+              if (isProperHaskellPackage value && isExecutable value) then statify value else value;
+          }
       );
     });
   };