Fix SAT warnings (#14202)

* Fix SAT warnings

- checkstyle.ModifierOrderCheck
- checkstyle.OneStatementPerLineCheck
- checkstyle.NeedBracesCheck
- PMD.UseStandardCharsets
- PMD.UseCollectionIsEmpty
- PMD.UnusedLocalVariable
- PMD.SimplifyBooleanReturns where reasonable, suppress where
readability is better without change
- PMD.SimplifyBooleanExpressions

* Include StandardCharsets

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

bundles/org.openhab.binding.samsungtv/src/main/java/org/openhab/binding/samsungtv/internal/handler/SamsungTvHandler.java

@@ -242,12 +242,12 @@ public class SamsungTvHandler extends BaseThingHandler implements RegistryListen
         boolean isOnline = false;
 
         for (Device<?, ?, ?> device : upnpService.getRegistry().getDevices()) {
-            if (createService((RemoteDevice) device) == true) {
+            if (createService((RemoteDevice) device)) {
                 isOnline = true;
             }
         }
 
-        if (isOnline == true) {
+        if (isOnline) {
             logger.debug("Device was online");
             putOnline();
         } else {