C++: Update test for fix to namespace members

Generation of IDs for namespace members has been fixed to generate
unique IDs for variables of the same name but in different namespaces.

Update the same_name test to validate this.

Author: Matthew Gretton-Dann

cpp/ql/test/library-tests/namespaces/same_name/decls.expected

@@ -7,5 +7,6 @@
 | file://:0:0:0:0 | (global namespace) | file://:0:0:0:0 | p#0 |
 | file://:0:0:0:0 | (global namespace) | file://:0:0:0:0 | p#0 |
 | file://:0:0:0:0 | (global namespace) | file://:0:0:0:0 | reg_save_area |
-| same_name.cpp:4:11:4:21 | namespace_a | same_name.cpp:2:11:2:11 | c |
+| file://:0:0:0:0 | (global namespace) | same_name.cpp:2:11:2:11 | c |
 | same_name.cpp:4:11:4:21 | namespace_a | same_name.cpp:6:12:6:12 | c |
+| same_name.cpp:9:11:9:21 | namespace_b | same_name.cpp:11:12:11:12 | c |

cpp/ql/test/library-tests/namespaces/same_name/same_name.cpp

@@ -8,9 +8,5 @@ namespace namespace_a
 
 namespace namespace_b
 {
-	//const int c = 1;
-	//
-	// this example is causing a DBCheck failure along the lines of:
-	// 
-	// [INVALID_KEY] Relation namespacembrs((@namespace parentid, unique @namespacembr memberid)): Value 132 of key field memberid occurs in several tuples. Two such tuples are: (134,132) and (144,132)
+	const int c = 1;
 }