ui: improve permission handling for hardware

ui: improve permission handling for hardware

qemu/HardwareView:

with the new Hardware privileges, we want to adapt a few places where
we now allow to show the add/edit window with those permissions.

form/{PCI,USB}Selector:

increase the minHeight property of the PCI/USBSelector, so that
the user can see the error message if he has not enough permissions.

data/PermPathStore:

add '/hardware' to the list of acl paths

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>