Check for the tool type when creating devices for tablet tools

Merged Peter Hutterer requested to merge whot/xf86-input-libinput:wip/tool-type-check into master

If a pen and an eraser had the same serial number and hw id, we didn't create multiple tools for them. Let's check the tool type as well because that's the only differing factor there.

Fixes #25 (closed)

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