Test: Fix test_gui_interface failure

Partially fixes #10478 about the following error:

ERROR: test_gui_interface (unittest.loader._FailedTest)
...
ModuleNotFoundError: No module named 'gajim.gui.emoji_data'
2 jobs for fix_gajim_history_manager_standalone in 0 seconds (queued for 92 minutes and 46 seconds)
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failed
code-quality Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
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