Revert "Add support for group item type to window covering (openhab#1…

…0936)"

This reverts commit 66252b4.

Signed-off-by: dw-8 <davy.wong.on+github@gmail.com>

bundles/org.openhab.io.homekit/src/main/java/org/openhab/io/homekit/internal/accessories/AbstractHomekitPositionAccessoryImpl.java

@@ -24,7 +24,6 @@
 
 import org.eclipse.jdt.annotation.NonNullByDefault;
 import org.eclipse.jdt.annotation.Nullable;
-import org.openhab.core.items.GroupItem;
 import org.openhab.core.items.Item;
 import org.openhab.core.library.items.DimmerItem;
 import org.openhab.core.library.items.NumberItem;
@@ -85,19 +84,12 @@ public CompletableFuture<Void> setTargetPosition(int value) {
         getCharacteristic(TARGET_POSITION).ifPresentOrElse(taggedItem -> {
             final Item item = taggedItem.getItem();
             final int targetPosition = convertPosition(value, openPosition);
-
             if (item instanceof RollershutterItem) {
                 ((RollershutterItem) item).send(new PercentType(targetPosition));
             } else if (item instanceof DimmerItem) {
                 ((DimmerItem) item).send(new PercentType(targetPosition));
             } else if (item instanceof NumberItem) {
                 ((NumberItem) item).send(new DecimalType(targetPosition));
-            } else if (item instanceof GroupItem && ((GroupItem) item).getBaseItem() instanceof RollershutterItem) {
-                ((GroupItem) item).send(new PercentType(targetPosition));
-            } else if (item instanceof GroupItem && ((GroupItem) item).getBaseItem() instanceof DimmerItem) {
-                ((GroupItem) item).send(new PercentType(targetPosition));
-            } else if (item instanceof GroupItem && ((GroupItem) item).getBaseItem() instanceof NumberItem) {
-                ((GroupItem) item).send(new DecimalType(targetPosition));
             } else {
                 logger.warn(
                         "Unsupported item type for characteristic {} at accessory {}. Expected Rollershutter, Dimmer or Number item, got {}",