[Merge] lp:~mitya57/indicator-applet/fix-duplicate-icons.focal into lp:indicator-applet/20.04

[Dmitry Shachnev]

This is a cherry-pick from main branch, so marking as Approved.
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https://code.launchpad.net/~mitya57/indicator-applet/fix-duplicate-icons.focal/+merge/391792
Your team Indicator Applet Developers is requested to review the proposed merge of lp:~mitya57/indicator-applet/fix-duplicate-icons.focal into lp:indicator-applet/20.04.