TrackerEvolutionPlugin: Do not spam tracker-status-icon.
TrackerEvolutionPlugin: Do not spam tracker-status-icon.

Now actual processing is reported in miner progress, not walking through every
mail folder, which made progress signalling go crazy.

hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker