Type bug in shared_random_state -- make sure Version is int.

The confparse field has type UINT, which corresponds to an int
type.  We had uint32_t.

This shouldn't cause trouble in practice, since int happens to
4-bytes wide on every platform where an authority is running.  It's
still wrong, though.

src/or/shared_random_state.h

@@ -77,7 +77,7 @@ typedef struct sr_state_t {
 typedef struct sr_disk_state_t {
   uint32_t magic_;
   /* Version of the protocol. */
-  uint32_t Version;
+  int Version;
   /* Version of our running tor. */
   char *TorVersion;
   /* Creation time of this state */