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.mielecloud/src/main/java/org/openhab/binding/mielecloud/internal/webservice/api/TransitionState.java

@@ -55,6 +55,7 @@ public class TransitionState {
         return previousState.map(this::hasFinishedChangedFromPreviousState).orElse(true);
     }
 
+    @SuppressWarnings("PMD.SimplifyBooleanReturns")
     private boolean hasFinishedChangedFromPreviousState(DeviceState previous) {
         if (previous.getStateType().equals(nextState.getStateType())) {
             return false;