correct the env var name

run

@@ -14,9 +14,9 @@ if [ "$code" == "unauthorized.bad_access_token.expired" ]; then
 		"client_secret=$client_secret" \
 		"refresh_token=$refresh_token")
 	echo $response
-	activity_token=$(echo $response | jq -r .access_token)
+	access_token=$(echo $response | jq -r .access_token)
 	refresh_token=$(echo $response | jq -r .refresh_token)
-	echo "activity_token=\"$activity_token\"" >> .env
+	echo "access_token=\"$access_token\"" >> .env
 	echo "refresh_token=\"$refresh_token\"" >> .env
 fi
 current_pot_value=$(echo -n $pots | jq ".pots[] | select(.id==\"$pot_id\") | .balance")