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.enturno/src/main/java/org/openhab/binding/enturno/internal/connection/EnturNoConnection.java

@@ -196,7 +196,7 @@ public class EnturNoConnection {
                 .collect(groupingBy(call -> call.quay.id));
 
         List<DisplayData> processedData = new ArrayList<>();
-        if (departures.keySet().size() > 0) {
+        if (!departures.keySet().isEmpty()) {
             DisplayData processedData01 = getDisplayData(stopPlace, departures, 0);
             processedData.add(processedData01);
         }