Make devicestate.version a private #define in the device code

mesh.proto

@@ -313,22 +313,9 @@ message DeviceState {
     /// Received packets saved for delivery to the phone 
     repeated MeshPacket receive_queue = 5;
 
-    enum Version {
-        option allow_alias = true;
-
-        /// default value for old files before we added version.
-        Unset = 0;
-
-        /// We bump up the integer values in this enum to indicate minimum levels of encodings for saved files
-        /// if your file is below the Minimum you should discard it.
-        Minimum = 17;
-
-        /// The current value we are using for saved files
-        Current = 17;
-    };
-
     /// A version integer used to invalidate old save files when we make incompatible changes
-    Version version = 6;
+    /// This integer is set at build time and is private to NodeDB.cpp in the device code.
+    uint32 version = 8;
 
     /// We keep the last received text message (only) stored in the device flash, so we can show it on the screen.  Might be null
     MeshPacket rx_text_message = 7;