C#: Update test expected output.

Author: michaelnebel

csharp/ql/test/library-tests/csharp11/PrintAst.expected

@@ -847,7 +847,7 @@ RequiredMembers.cs:
 #   40|         0: [Parameter] value
 Scoped.cs:
 #    1| [Struct] S1
-#    2| [Struct] S2
+#    2| [RefStruct] S2
 #    7| [Class] ScopedModifierTest
 #    9|   5: [Method] M1
 #    9|     -1: [TypeMention] int
@@ -1402,7 +1402,7 @@ Strings.cs:
 Struct.cs:
 #    1| [NamespaceDeclaration] namespace ... { ... }
 #    3|   1: [Class] MyEmptyClass
-#    5|   2: [Struct] RefStruct
+#    5|   2: [RefStruct] RefStruct
 #    7|     5: [Field] MyInt
 #    7|       -1: [TypeMention] int
 #    8|     6: [Field] MyByte

csharp/ql/test/library-tests/csharp7.2/PrintAst.expected

@@ -30,8 +30,8 @@ csharp72.cs:
 #   26|           0: [FieldAccess] access to field s
 #   29|   7: [DelegateType] Del
 #   32| [Struct] ReadonlyStruct
-#   36| [Struct] RefStruct
-#   40| [Struct] ReadonlyRefStruct
+#   36| [RefStruct] RefStruct
+#   40| [RefStruct] ReadonlyRefStruct
 #   44| [Class] NumericLiterals
 #   46|   5: [Field] binaryValue
 #   46|     -1: [TypeMention] int

csharp/ql/test/library-tests/csharp7.2/RefStructs.ql

@@ -1,7 +1,5 @@
 import csharp
 
-from Struct s
-where
-  s.fromSource() and
-  s.isRef()
+from RefStruct s
+where s.fromSource()
 select s