Load iconRes for airplane tile

Will reduce redundant states since iconRes will be compared.

Bug: 356254554
Flag: com.android.systemui.qs_new_tiles
Test: atest AirplaneModeMapperTest
Test: manual. Open shade. handleStateChanged with airplane spec should
not be called more than once. There used to be 3 calls.

Change-Id: If855e75c0fa6e030b27501d4fb47507d0c4e1011