fixup! Add tests

Author: matheusaaguiar

test/cmdlineTests/storage_layout_already_defined_in_ancestor/err

@@ -1,20 +1,9 @@
-Error: Storage layout can only be specified in the most derived contract.
- --> <stdin>:5:1:
+Error: Cannot inherit from a contract with a custom storage layout.
+ --> <stdin>:5:15:
   |
 5 | contract B is A {}
-  | ^^^^^^^^^^^^^^^^^^
-Note: Storage layout was already specified here.
- --> <stdin>:4:12:
-  |
-4 | contract A layout at 0x1234 {}
-  |            ^^^^^^^^^^^^^^^^
-
-Error: Storage layout can only be specified in the most derived contract.
- --> <stdin>:6:1:
-  |
-6 | contract C layout at 0x1234 is B {}
-  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Note: Storage layout was already specified here.
+  |               ^
+Note: Custom storage layout defined here:
  --> <stdin>:4:12:
   |
 4 | contract A layout at 0x1234 {}