[Merge] lp:~lanoxx/indicator-applet/fix-duplicate-icons into lp:indicator-applet

[Alberts Muktupāvels]

Before merging we should check if this does not re-introduce problem - https://bazaar.launchpad.net/~indicator-applet-developers/indicator-applet/trunk.13.10/revision/403
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https://code.launchpad.net/~lanoxx/indicator-applet/fix-duplicate-icons/+merge/390344
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