Fix install apps button

- Setting the button's user via iteminfo to the privateprofile user
doesn't let the user to go into the play store. This was initially done so that
we can check the itemInfo to see if item is private space instead of just checking
if the item has a decorationInfo for collapse animation.
- The itemInfo change is reverted and we can check that case by checking with instanceOf PrivateSpaceInstallAppButtonInfo

bug:335600922
Test manually video: https://drive.google.com/file/d/1N2zOHvPmBptBaBf8SCqjBAM6UhV0lQBI/view?usp=sharing
Flag: ACONFIG com.android.launcher3.enable_private_space TRUNKFOOD

Change-Id: I09f22c9df5b4f9408eea6995eafea83e30c93a0d