[Input preference] Duplicate settings

[X512]

This is hrev53835.

Input preference built from hrev53839.

USB Mouse 1 and Wacom Tablets settings are the same, but changes independently and don't reflect each other. After Restarting input preference settings became the same again.

It's confusing that multiple items share same settings.

[pulkomandy]

It's fixed now, each mouse actually has independant settings.

[nielx]

Assign fix to milestone:R1/beta3, as it looks like this fix will be part of that release.

As we started with the previous beta, we would like to use the Milestone field for fixed tickets to log from which release the improvement will be out. Therefore it is very much appreciated to assign the milestone when closing a ticket as fixed.