C#: Update test output.

Author: calumgrant

csharp/ql/test/library-tests/standalone/controlflow/cfg.expected

@@ -17,13 +17,11 @@
 | ControlFlow.cs:10:22:10:26 | access to property (unknown) | ControlFlow.cs:10:29:10:42 | "This is true" |
 | ControlFlow.cs:10:29:10:42 | "This is true" | ControlFlow.cs:10:9:10:43 | Call (unknown target) |
 | ControlFlow.cs:10:29:10:42 | "This is true" | ControlFlow.cs:10:9:10:43 | call to method  |
-| ControlFlow.cs:12:9:12:86 | Call (unknown target) | ControlFlow.cs:12:37:12:47 | Expression |
+| ControlFlow.cs:12:9:12:86 | Call (unknown target) | ControlFlow.cs:12:51:12:62 | access to field Empty |
 | ControlFlow.cs:12:9:12:87 | ...; | ControlFlow.cs:12:9:12:86 | Call (unknown target) |
 | ControlFlow.cs:12:35:12:86 | { ..., ... } | ControlFlow.cs:7:10:7:10 | exit F |
-| ControlFlow.cs:12:37:12:47 | Expression | ControlFlow.cs:12:51:12:62 | access to field Empty |
-| ControlFlow.cs:12:37:12:62 | ... = ... | ControlFlow.cs:12:65:12:75 | Expression |
+| ControlFlow.cs:12:37:12:62 | ... = ... | ControlFlow.cs:12:79:12:79 | access to local variable v |
 | ControlFlow.cs:12:51:12:62 | access to field Empty | ControlFlow.cs:12:37:12:62 | ... = ... |
-| ControlFlow.cs:12:65:12:75 | Expression | ControlFlow.cs:12:79:12:79 | access to local variable v |
 | ControlFlow.cs:12:65:12:84 | ... = ... | ControlFlow.cs:12:35:12:86 | { ..., ... } |
 | ControlFlow.cs:12:79:12:79 | access to local variable v | ControlFlow.cs:12:79:12:84 | Call (unknown target) |
 | ControlFlow.cs:12:79:12:79 | access to local variable v | ControlFlow.cs:12:79:12:84 | access to property (unknown) |