Remove unknown event handlers

[carlgieringer]

I get these errors in the console on app load:

• Warning: Unknown event handler property onClickChip. It will be ignored.
• Warning: Unknown event handler property onClickAvatar. It will be ignored.

Fuller stack traces:

Warning: Unknown event handler property `onClickChip`. It will be ignored.
    in div (created by ChipsList)
    in ChipsList (created by TagsViewer)
    in TagsViewer (created by TagsControl)
    in TagsControl (created by PropositionTagger)
    in PropositionTagger (created by JustificationRootTargetCard)
    ...
react_devtools_backend.js:2655 Warning: Unknown event handler property `onClickAvatar`. It will be ignored.
    in div (created by ChipsList)
    in ChipsList (created by TagsViewer)
    in TagsViewer (created by TagsControl)
    in TagsControl (created by PropositionTagger)
    in PropositionTagger (created by JustificationRootTargetCard)
   ...