[habot] Change "Removing old ephemeral card" log message to debug level (#1138)

Signed-off-by: Matthew Skinner <matt@pcmus.com>

bundles/org.openhab.ui.habot/src/main/java/org/openhab/ui/habot/card/internal/CardRegistry.java

@@ -100,7 +100,7 @@ public class CardRegistry extends AbstractRegistry<Card, String, CardProvider> {
                 .collect(Collectors.toList());
 
         for (Card card : oldCards) {
-            logger.info("Removing old ephemeral card {}", card.getUID());
+            logger.debug("Removing old ephemeral card {}", card.getUID());
             remove(card.getUID());
         }