C#: Update expected test output.

Author: michaelnebel

csharp/ql/test/library-tests/exprorstmtparent/Callable.expected

@@ -29,7 +29,7 @@
 | A.cs:28:7:28:8 | C3 | B.cs:25:7:25:8 | {...} |
 | A.cs:30:21:30:23 | get_P3 | A.cs:30:28:30:37 | throw ... |
 | A.cs:34:15:34:16 | C4 | A.cs:34:15:34:16 | {...} |
-| A.cs:34:15:34:16 | C4 | C.cs:1:15:1:16 | {...} |
+| A.cs:34:15:34:16 | C4 | B.cs:30:15:30:16 | {...} |
 | A.cs:36:9:36:10 | M1 | A.cs:36:14:36:28 | {...} |
 | A.cs:36:9:36:10 | M1 | B.cs:32:17:32:17 | 0 |
 | A.cs:37:9:37:10 | M2 | A.cs:37:14:37:28 | {...} |