Refresh `mNumAppsPerRowAllApps` when device profile changes.

The return value of SrollableLayoutManager#getItemsHeight is wrong, which is caused by the return value of `incrementTotalHeight` (https://source.corp.google.com/h/googleplex-android/platform/superproject/main/+/main:packages/apps/Launcher3/src/com/android/launcher3/util/ScrollableLayoutManager.java;l=151-163). In AllAppsGridAdapter#incrementTotalHeight (https://source.corp.google.com/h/googleplex-android/platform/superproject/main/+/main:packages/apps/Launcher3/src/com/android/launcher3/allapps/AllAppsGridAdapter.java;l=172), `item.rowAppIndex` is still the staled value after app grid change / device fold & unfold. This value is calculated in AlphabeticalAppsList (https://source.corp.google.com/h/googleplex-android/platform/superproject/main/+/main:packages/apps/Launcher3/src/com/android/launcher3/allapps/AlphabeticalAppsList.java;l=276-280). The mod `mNumAppsPerRowAllApps` is staled. So add an setter in `AlphabeticalAppsList` to update `mNumAppsPerRowAllApps`.

Bug: 262003765
Bug: 284940820
Test: manual
Flag: N/A
Change-Id: I74a99a3dc58ee45f066bcefb3e9c56be02b62f82