Remove no_implicit_stdlib option

test/contracts/manual_stdlib_include.aes

@@ -1,5 +1,4 @@
-// This contract should be compiled with no_implicit_stdlib option.
-// It should include Lists.aes implicitly however, because Option.aes depends on it.
+// This should include Lists.aes implicitly, since Option.aes does.
 include "Option.aes"
 
 contract Test =

test/contracts/stdlib_include.aes

@@ -1,3 +1,6 @@
+include "List.aes"
+include "Func.aes"
+
 contract StdInc =
   entrypoint test() = List.map((x) => Func.id(x), [1,2,3,4])