Fix bug causing issue updated timestamp to be incorrectly updated

Token balances were being stored in Postgres as double and
multisig/token-balance was returning the value as a float. This caused
equality comparisons to fail for equal balances, leading to erroneusly
updating github comments and issue updated timestamps.

src/clj/commiteth/eth/multisig_wallet.clj

@@ -141,7 +141,7 @@
                (Math/pow 10 token-base)
                token-base)]
     (assert (> base 0))
-    (float (/ value base))))
+    (double (/ value base))))
 
 
 (defn token-balance-in-bounty