Fix taskbar education not touchable if taskbar is stashed

Instead of assuming taskbar window is not touchable while taskbar is stashed, fall through to the areIconsVisible() check, which already returns false if taskbar is stashed anyway. Additionally, add a check for AbstractFloatingView so we appropriately allow touches if one exists.

Test: Open Contacts, can still touch through stashed handle; start TaskbarEduView flow and can touch whether taskbar is stashed or not
Fixes: 199376513
Change-Id: If362bad5cb8262fc8c489010e4b2d306ac5f252a