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/Utils.h b/Utils.h
index 5bb2855..4c0114a 100644
--- a/Utils.h
+++ b/Utils.h
@@ -34,7 +34,7 @@
 namespace android {
 namespace vold {
 
-static const char* kPropFuseSnapshot = "sys.fuse_snapshot";
+static const char* kPropFuse = "persist.sys.fuse";
 
 /* SELinux contexts used depending on the block device type */
 extern security_context_t sBlkidContext;