fix: update decimals (#81)

* fix: specify decimals for WBTC and USDT

* forge install: simple-erc20

f5c2597ec179ea13e219ccbca415dc59d5a33398

* snapshot

Author: anna-carroll

Diff for: .gas-snapshot

@@ -1,8 +1,8 @@
 GnosisSafeTest:test_gnosis_receive() (gas: 15927)
 OrderOriginPermit2Test:test_fillPermit2() (gas: 223464)
-OrderOriginPermit2Test:test_fillPermit2_multi() (gas: 1005464)
+OrderOriginPermit2Test:test_fillPermit2_multi() (gas: 1007964)
 OrderOriginPermit2Test:test_initiatePermit2() (gas: 233946)
-OrderOriginPermit2Test:test_initiatePermit2_multi() (gas: 982006)
+OrderOriginPermit2Test:test_initiatePermit2_multi() (gas: 984506)
 OrdersTest:test_fill_ERC20() (gas: 71459)
 OrdersTest:test_fill_ETH() (gas: 69090)
 OrdersTest:test_fill_both() (gas: 169814)
@@ -17,7 +17,7 @@ OrdersTest:test_orderExpired() (gas: 28383)
 OrdersTest:test_sweepERC20() (gas: 60695)
 OrdersTest:test_sweepETH() (gas: 83379)
 OrdersTest:test_underflowETH() (gas: 63976)
-PassagePermit2Test:test_disallowedEnterPermit2() (gas: 689028)
+PassagePermit2Test:test_disallowedEnterPermit2() (gas: 691528)
 PassagePermit2Test:test_enterTokenPermit2() (gas: 144090)
 PassageTest:test_configureEnter() (gas: 128735)
 PassageTest:test_disallowedEnter() (gas: 57503)

Diff for: lib/simple-erc20

@@ -26,8 +26,8 @@ contract L2Script is Script {
         rollupOrders = address(new RollupOrders{salt: "zenith.rollupOrders"}(PERMIT2));
 
         // deploy simple erc20 tokens
-        wbtc = address(new SimpleERC20{salt: "zenith.wbtc"}(MINTER, "Wrapped BTC", "WBTC"));
-        usdt = address(new SimpleERC20{salt: "zenith.usdt"}(MINTER, "Tether USD", "USDT"));
+        wbtc = address(new SimpleERC20{salt: "zenith.wbtc"}(MINTER, "Wrapped BTC", "WBTC", 8));
+        usdt = address(new SimpleERC20{salt: "zenith.usdt"}(MINTER, "Tether USD", "USDT", 6));
     }
 }