Change isIncrementalFsPath to return false on host.

The return value doesn't matter, but false makes more sense.

Bug: 270454539
Change-Id: I1387b044f888a95b8c59e5e8926695a5913ece50
Test: Presubmit
Ignore-AOSP-First: ART Services
(cherry picked from commit on googleplex-android-review.googlesource.com host: 96fe3b59bafe1a82abf2920285b2285add6dd8f6)
Merged-In: I1387b044f888a95b8c59e5e8926695a5913ece50
diff --git a/artd/artd.cc b/artd/artd.cc
index 39534b7..3b59ea3 100644
--- a/artd/artd.cc
+++ b/artd/artd.cc
@@ -1062,7 +1062,7 @@
   *_aidl_return = st.f_type == INCFS_MAGIC_NUMBER;
   return ScopedAStatus::ok();
 #else
-  *_aidl_return = true;
+  *_aidl_return = false;
   return ScopedAStatus::ok();
 #endif
 }