ci: fix [if xyz ?] usages

vlib/v/checker/tests/custom_comptime_define_if_debug.vv

@@ -3,7 +3,7 @@ fn foo(x int) {
 	println('foo, x: $x')
 }
 
-[if bar]
+[if bar ?]
 fn bar(x int) {
 	println('bar, x: $x')
 }

vlib/v/checker/tests/custom_comptime_define_if_flag.vv

@@ -1,6 +1,6 @@
 // Calls to edebug/1 should be executed only when `-d mydebug` is passed on the CLI
 // Otherwise they will not be present *at all* in the generated code.
-[if mydebug]
+[if mydebug ?]
 fn edebug(message string) {
 	println('message: $message')
 }