Fix test (not sure why this one test needs fixing)

Author: Guido van Rossum

test-data/unit/check-incremental.test

@@ -1113,7 +1113,7 @@ val = "foo"
 
 [builtins fixtures/module_all.pyi]
 [rechecked main, c, c.submodule]
-[stale]
+[stale c]
 [out2]
 tmp/c/submodule.py:2: error: Incompatible types in assignment (expression has type "str", variable has type "int")
 tmp/main.py:7: error: "C" has no attribute "foo"