Java 17 features (H-M) (#15520)

- add missing @override
- Java style array syntax
- remove redundant modifiers
- always move String constants to left side in comparisons
- simplify lambda expressions and return statements
- use replace instead of replaceAll w/o regex
- instanceof matching and multiline strings
- remove null check before instanceof

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

bundles/org.openhab.binding.modbus.e3dc/src/main/java/org/openhab/binding/modbus/e3dc/internal/handler/E3DCThingHandler.java

@@ -276,9 +276,8 @@ public class E3DCThingHandler extends BaseBridgeHandler {
             return null;
         }
 
-        if (handler instanceof ModbusEndpointThingHandler) {
-            ModbusEndpointThingHandler slaveEndpoint = (ModbusEndpointThingHandler) handler;
-            return slaveEndpoint;
+        if (handler instanceof ModbusEndpointThingHandler thingHandler) {
+            return thingHandler;
         } else {
             logger.debug("Unexpected bridge handler: {}", handler);
             return null;