[ddwrt] remove unneeded variable

code review PR openhab#20505

Co-authored-by: lsiepel <leosiepel@gmail.com>
Signed-off-by: Lee Ballard <ballle98@gmail.com>

Author: ballle98

bundles/org.openhab.binding.ddwrt/src/main/java/org/openhab/binding/ddwrt/internal/DDWRTDiscoveryService.java

@@ -85,9 +85,8 @@ protected void startBackgroundDiscovery() {
         logger.debug("Starting DD-WRT background discovery");
         ScheduledFuture<?> job = backgroundDiscoveryJob;
         if (job == null || job.isCancelled()) {
-            int intervalSeconds = DISCOVERY_TIMEOUT_SECONDS;
             backgroundDiscoveryJob = scheduler.scheduleWithFixedDelay(this::startScan,
-                    BACKGROUND_DISCOVERY_INITIAL_DELAY_SECONDS, intervalSeconds, TimeUnit.SECONDS);
+                    BACKGROUND_DISCOVERY_INITIAL_DELAY_SECONDS, DISCOVERY_TIMEOUT_SECONDS, TimeUnit.SECONDS);
         }
         // Register as refresh listener so discovery runs immediately after device refresh
         DDWRTNetwork net = thingHandler.getNetwork();