fix required attribute (openhab#21121)

Signed-off-by: Andrew Fiddian-Green <software@whitebear.ch>

Author: andrewfg

bundles/org.openhab.binding.souliss/src/main/resources/OH-INF/thing/thing-types.xml

@@ -17,7 +17,7 @@
 				<description>LAN IP address (mandatory)
 				</description>
 			</parameter>
-			<parameter name="gatewayWanAddress" type="text" required="true"
+			<parameter name="gatewayWanAddress" type="text" required="false"
 				pattern="^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$|^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)+([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$">
 				<label>IPv4 WAN Address</label>
 				<description>WAN hostname or IP in case of external network access