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.goecharger/src/main/java/org/openhab/binding/goecharger/internal/handler/GoEChargerV2Handler.java

@@ -68,6 +68,7 @@ public class GoEChargerV2Handler extends GoEChargerBaseHandler {
         super(thing, httpClient);
     }
 
+    @SuppressWarnings("PMD.SimplifyBooleanExpressions")
     @Override
     protected State getValue(String channelId, GoEStatusResponseBaseDTO goeResponseBase) {
         var state = super.getValue(channelId, goeResponseBase);