Also expose two-part sensors as three-part sensors in ksysguardd
ksystemstats expects sensors to consist of at least three parts: subsystem, object, property. Sensors like "system/processors" break this assumption, causing them to not be properly readable. Rather than trying to come up with an elaborate way to handle this in ksystemstats, simply expose them also as a three-part sensor so the mapping doesn't need to change. These sensors are not very dynamic anyway so duplicating them does not do much harm. The two-part version is kept around for backward compatibility with the ksysguard UI.
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