remove optional event parameters. it breaks some accessories in home app

Signed-off-by: Eugen Freiter <freiter@gmx.de>

Author: Eugen Freiter

src/main/java/io/github/hapjava/characteristics/impl/base/BaseCharacteristic.java

@@ -113,7 +113,6 @@ protected CompletableFuture<JsonObjectBuilder> makeBuilder(int instanceId) {
                       .add("type", shortType)
                       .add("perms", perms.build())
                       .add("format", format)
-                      .add("ev", false)
                       .add("description", description);
               if (isReadable) setJsonValue(builder, value);
               return builder;