Remove unused ic_groups.xml

Author: bmarty

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/icons/IconsList.kt

@@ -14,7 +14,6 @@ import io.element.android.libraries.designsystem.R
 internal val iconsOther = listOf(
     R.drawable.ic_cancel,
     R.drawable.ic_encryption_enabled,
-    R.drawable.ic_groups,
     R.drawable.ic_notification_small,
     R.drawable.ic_plus_composer,
     R.drawable.ic_stop,