Properly intercept touches

We were using the view's canScrollX methods, instead of getting the
values from the actual scrollable in Compose.

Also, only intercept touches that are more vertical than horizontal.

Test: manual, more touches accepted + edit mode scrolls
Fixes: 400438156
Flag: com.android.systemui.qs_ui_refactor_compose_fragment
Change-Id: If8e310b49b1218a07cf8b10359e660fdc23b6256