Add deletion of isAirdrop from removeModule.

Author: bweick

contracts/protocol/modules/AirdropModule.sol

@@ -246,6 +246,12 @@ contract AirdropModule is ModuleBase, ReentrancyGuard {
      * Airdrops are not absorbed.
      */
     function removeModule() external override {
+        address[] memory airdrops = airdropSettings[ISetToken(msg.sender)].airdrops;
+
+        for (uint256 i =0; i < airdrops.length; i++) {
+            isAirdrop[ISetToken(msg.sender)][IERC20(airdrops[i])] = false;
+        }
+
         delete airdropSettings[ISetToken(msg.sender)];
     }
 

test/protocol/modules/airdropModule.spec.ts

@@ -981,6 +981,16 @@ describe("AirdropModule", () => {
       expect(airdropSettings.airdropFee).to.eq(ZERO);
       expect(airdropSettings.anyoneAbsorb).to.be.false;
     });
+
+    it("should reset the isAirdrop mapping", async () => {
+      await subject();
+
+      const wethIsAirdrop = await airdropModule.isAirdrop(subjectModule, setup.weth.address);
+      const usdcIsAirdrop = await airdropModule.isAirdrop(subjectModule, setup.usdc.address);
+
+      expect(wethIsAirdrop).to.be.false;
+      expect(usdcIsAirdrop).to.be.false;
+    });
   });
 
   describe("CONTEXT: Airdrop add/remove", async () => {