udev rules should use RUN+= rather than RUN=

[Felix Geyer]

From ​https://bugs.launchpad.net/ubuntu/+source/virtualbox-ose/+bug/776535:

The udev rules shipped by virtualbox-ose apply a RUN script on usb interfaces and devices. However the rules specify
RUN=
rather than
RUN+=
so all other scripts added by previous rules get usurped.

This means things like my scanner (which relies on a script added by the sane udev rules) doesn't work.

The solution is to simply replace all RUN= with RUN+= in the udev rules - the rules should add the script, now set this script only.

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Also, the rules should use == instead of = to match SUBSYSTEM and ACTION.

[Frank Mehnert]

Fixed in 4.1.