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.deconz/src/main/java/org/openhab/binding/deconz/internal/handler/LightThingHandler.java

@@ -392,7 +392,7 @@ public class LightThingHandler extends DeconzBaseThingHandler {
                 }
                 break;
             case CHANNEL_COLOR:
-                if (on != null && on == false) {
+                if (on != null && !on) {
                     updateState(channelId, OnOffType.OFF);
                 } else if (bri != null && "xy".equals(newState.colormode)) {
                     final double @Nullable [] xy = newState.xy;