Replace "sys.fuse_snapshot" with "persist.sys.fuse"

With the newly added flag for Settings developer options, which is now
used to change the state of FUSE, PROP_FUSE now acts as the snapshot
feature flag for the current boot.

Bug: 145391093
Test: atest AdoptableHostTest
Change-Id: I22363b088e88c764294cbd61c6d94160c907fae3
diff --git a/model/PublicVolume.cpp b/model/PublicVolume.cpp
index b9164f5..78f150d 100644
--- a/model/PublicVolume.cpp
+++ b/model/PublicVolume.cpp
@@ -223,7 +223,7 @@
     /* sdcardfs will have exited already. The filesystem will still be running */
     TEMP_FAILURE_RETRY(waitpid(sdcardFsPid, nullptr, 0));
 
-    bool isFuse = base::GetBoolProperty(kPropFuseSnapshot, false);
+    bool isFuse = base::GetBoolProperty(kPropFuse, false);
     if (isFuse) {
         // We need to mount FUSE *after* sdcardfs, since the FUSE daemon may depend
         // on sdcardfs being up.