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.velbus/src/main/java/org/openhab/binding/velbus/internal/handler/VelbusRelayWithInputHandler.java

@@ -91,11 +91,7 @@ public class VelbusRelayWithInputHandler extends VelbusRelayHandler {
     private boolean isTriggerChannel(byte address, byte channel) {
         VelbusChannelIdentifier velbusChannelIdentifier = new VelbusChannelIdentifier(address, channel);
 
-        if (getModuleAddress().getChannelNumber(velbusChannelIdentifier) == 6) {
-            return true;
-        } else {
-            return false;
-        }
+        return getModuleAddress().getChannelNumber(velbusChannelIdentifier) == 6;
     }
 
     @Override