C++: Fix string literal expectation

Author: AlexDenisov

cpp/ql/test/library-tests/variables/getanassignedvalue/getanassignedvalue.expected

@@ -1,4 +1,3 @@
-| file://:0:0:0:0 | abc | test.cpp:53:6:53:11 | chars1 |
 | file://:0:0:0:0 | {...} | test.cpp:38:22:38:22 | v |
 | test.cpp:4:9:4:11 | 10 | test.cpp:4:6:4:6 | v |
 | test.cpp:5:15:5:16 | & ... | test.cpp:5:7:5:11 | ptr_v |
@@ -23,5 +22,6 @@
 | test.cpp:48:18:48:18 | 4 | test.cpp:31:6:31:8 | num |
 | test.cpp:48:21:48:26 | Four | test.cpp:32:14:32:16 | str |
 | test.cpp:52:19:52:27 | {...} | test.cpp:52:5:52:11 | myArray |
+| test.cpp:53:17:53:21 | abc | test.cpp:53:6:53:11 | chars1 |
 | test.cpp:54:17:54:31 | {...} | test.cpp:54:6:54:11 | chars2 |
 | test.cpp:55:16:55:20 | abc | test.cpp:55:7:55:12 | chars3 |