fix: adapt tests/neg-custom-args/captures/use-capset.check to cc stdlib

Author: hamzaremmal

tests/neg-custom-args/captures/use-capset.check

@@ -10,10 +10,10 @@
 -- [E007] Type Mismatch Error: tests/neg-custom-args/captures/use-capset.scala:13:50 -----------------------------------
 13 |  val _: () -> List[Object^{io}] -> Object^{io} = h2 // error, should be ->{io}
    |                                                  ^^
-   |                                                Found:    (h2 : () ->{} List[Object^{io}]^{} ->{io} Object^{io})
-   |                                                Required: () -> List[Object^{io}] -> Object^{io}
+   |                                                  Found:    (h2 : () ->{} List[Object^{io}] ->{io} Object^{io})
+   |                                                  Required: () -> List[Object^{io}] -> Object^{io}
    |
-   |                                                Note that capability io is not included in capture set {}.
+   |                                                  Note that capability io is not included in capture set {}.
    |
    | longer explanation available when compiling with `-explain`
 -- Error: tests/neg-custom-args/captures/use-capset.scala:5:49 ---------------------------------------------------------