Enable isolated storage by default.

We've been dogfooding the isolated storage feature for many months
on various internal groups, and we're ready to enable it globally.

Bug: 112545973
Test: executed entire CTS suite using forrest
Change-Id: I612b6aba4f08dc0ac13f4f94b03c4bddd6de12df
diff --git a/VolumeManager.cpp b/VolumeManager.cpp
index 3180d45..db098e3 100644
--- a/VolumeManager.cpp
+++ b/VolumeManager.cpp
@@ -115,7 +115,7 @@
 VolumeManager::~VolumeManager() {}
 
 static bool hasIsolatedStorage() {
-    return GetBoolProperty(kIsolatedStorageSnapshot, GetBoolProperty(kIsolatedStorage, false));
+    return GetBoolProperty(kIsolatedStorageSnapshot, GetBoolProperty(kIsolatedStorage, true));
 }
 
 int VolumeManager::updateVirtualDisk() {