test: try to fix flaky test

the error is related to account sequence mismatch, so using different
accounts than the other test cases might fix it.

tests/e2e/e2e_feegrant_test.go

@@ -25,9 +25,9 @@ func (s *IntegrationTestSuite) testFeeGrant() {
 			api    = fmt.Sprintf("http://%s", s.valResources[c.id][valIdx].GetHostPort("1317/tcp"))
 		)
 
-		alice, _ := c.genesisAccounts[1].keyInfo.GetAddress()
-		bob, _ := c.genesisAccounts[2].keyInfo.GetAddress()
-		charlie, _ := c.genesisAccounts[3].keyInfo.GetAddress()
+		alice, _ := c.genesisAccounts[4].keyInfo.GetAddress()
+		bob, _ := c.genesisAccounts[5].keyInfo.GetAddress()
+		charlie, _ := c.genesisAccounts[6].keyInfo.GetAddress()
 
 		// add fee grant from alice to bob
 		s.execFeeGrant(

tests/e2e/e2e_setup_test.go

@@ -180,7 +180,7 @@ func (s *IntegrationTestSuite) initNodes(c *chain) {
 	c.genesisAccounts[2]: Test Account 1
 	c.genesisAccounts[3]: Test Account 2
 	*/
-	s.Require().NoError(c.addAccountFromMnemonic(5))
+	s.Require().NoError(c.addAccountFromMnemonic(7))
 	// Initialize a genesis file for the first validator
 	val0ConfigDir := c.validators[0].configDir()
 	var addrAll []sdk.AccAddress