CS6.7 - Remove unreachable code (#227)

From ChainSecurity audit: "The submissionToken will never be equal to
EXHAUSTED in this context, as this is the value provided by the user of
the wallet and submitted to the nonce manager, which asserts that it is
different from EXHAUSTED."

This appears to be true, so we can remove this check.

.gas-snapshot

@@ -12,7 +12,7 @@ CallbacksTest:testNestedCallbackResetsCallbackSlot() (gas: 87858)
 CallbacksTest:testPayableCallback() (gas: 76928)
 CallbacksTest:testReentrancyGuardProtectsAgainstDoubleDipping() (gas: 54343)
 CallbacksTest:testRevertsOnCallbackWhenNoActiveCallback() (gas: 72601)
-CallbacksTest:testSimpleCallback() (gas: 284574)
+CallbacksTest:testSimpleCallback() (gas: 284460)
 CallbacksTest:testWithClearedCallback() (gas: 156369)
 CallbacksTest:testWithoutAllowCallback() (gas: 156138)
 CodeJarTest:testCodeJarCanBeWacky() (gas: 114646)
@@ -69,14 +69,14 @@ MulticallTest:testSupplyWETHWithdrawUSDCOnComet() (gas: 247586)
 NoncerTest:testGetActiveNonceNested() (gas: 88525)
 NoncerTest:testGetActiveNonceReplayable() (gas: 65730)
 NoncerTest:testGetActiveNonceSingle() (gas: 44961)
-NoncerTest:testGetActiveReplayCount() (gas: 85439)
-NoncerTest:testGetActiveReplayCountNested() (gas: 89032)
-NoncerTest:testGetActiveReplayCountSingle() (gas: 44824)
-NoncerTest:testGetActiveReplayCountWithNonReplaySoftCancel() (gas: 69406)
+NoncerTest:testGetActiveReplayCount() (gas: 85364)
+NoncerTest:testGetActiveReplayCountNested() (gas: 88957)
+NoncerTest:testGetActiveReplayCountSingle() (gas: 44799)
+NoncerTest:testGetActiveReplayCountWithNonReplaySoftCancel() (gas: 69325)
 NoncerTest:testGetActiveSubmissionTokenNested() (gas: 88031)
 NoncerTest:testGetActiveSubmissionTokenReplayable() (gas: 65756)
 NoncerTest:testGetActiveSubmissionTokenSingle() (gas: 47765)
-NoncerTest:testNestedPlayPullingActiveReplayCount() (gas: 608396)
+NoncerTest:testNestedPlayPullingActiveReplayCount() (gas: 608321)
 NoncerTest:testPostNestReadsCorrectValue() (gas: 141247)
 PaycallTest:testInitializeProperlyFromConstructor() (gas: 6368)
 PaycallTest:testPaycallForPayWithUSDT() (gas: 116565)

src/quark-core/src/QuarkScript.sol

@@ -178,10 +178,6 @@ abstract contract QuarkScript {
         bytes32 submissionToken = getActiveSubmissionToken();
         uint256 n;
 
-        if (submissionToken == QuarkNonceManagerMetadata.EXHAUSTED) {
-            return 0;
-        }
-
         for (n = 0; submissionToken != nonce; n++) {
             submissionToken = keccak256(abi.encodePacked(submissionToken));
         }