aconfig: Respect flag naming convention on test flags

Test: atest aconfig.test
Bug: 311152507
Change-Id: I960867d32415007db5dacab57e97b813cbbee650
diff --git a/tools/aconfig/src/commands.rs b/tools/aconfig/src/commands.rs
index d80a31b..be32bde 100644
--- a/tools/aconfig/src/commands.rs
+++ b/tools/aconfig/src/commands.rs
@@ -370,7 +370,7 @@
         assert_eq!(ProtoFlagState::ENABLED, enabled_ro.trace[2].state());
         assert_eq!(ProtoFlagPermission::READ_ONLY, enabled_ro.trace[2].permission());
 
-        assert_eq!(7, parsed_flags.parsed_flag.len());
+        assert_eq!(8, parsed_flags.parsed_flag.len());
         for pf in parsed_flags.parsed_flag.iter() {
             if pf.name() == "enabled_fixed_ro" {
                 continue;