remove DVM deposit 1000 min deposit limit

contracts/DODOVendingMachine/impl/DVMFunding.sol

@@ -50,8 +50,8 @@ contract DVMFunding is DVMVault {
         // 在提币的时候向下取整。因此永远不会出现，balance为0但totalsupply不为0的情况
         // 但有可能出现，reserve>0但totalSupply=0的场景
         if (totalSupply == 0) {
-            shares = baseBalance.sub(10**3); // 以免出现balance很大但shares很小的情况
-            _mint(address(0), 10**3);
+            require(baseBalance >= 10**3); // 以免出现balance很大但shares很小的情况
+            shares = baseBalance;
         } else if (baseReserve > 0 && quoteReserve == 0) {
             // case 2. supply when quote reserve is 0
             shares = baseInput.mul(totalSupply).div(baseReserve);