C++: Accept qltest change (useless guard tautology removed).

Author: aschackmull

cpp/ql/test/library-tests/controlflow/guards/GuardsControl.expected

@@ -115,7 +115,6 @@
 | test.c:127:9:127:9 | 1 | not 0 | test.c:131:10:132:16 | { ... } |
 | test.c:131:7:131:7 | b | not 0 | test.c:131:10:132:16 | { ... } |
 | test.c:131:7:131:7 | b | true | test.c:131:10:132:16 | { ... } |
-| test.c:137:7:137:7 | 0 | 0 | test.c:142:3:136:10 | return ... |
 | test.c:137:7:137:7 | 0 | false | test.c:142:3:136:10 | return ... |
 | test.c:145:16:145:16 | x | 0 | test.c:146:11:147:9 | { ... } |
 | test.c:146:7:146:8 | ! ... | true | test.c:146:11:147:9 | { ... } |