Re-activate linux gui tests (#914)

Co-authored-by: Anwai Archit <[email protected]>

Author: constantinpape

test/test_sam_annotator/test_annotator_2d.py

@@ -9,7 +9,8 @@
 
 
 @pytest.mark.gui
-@pytest.mark.skipif(platform.system() in ("Windows", "Linux"), reason="Gui test is not working on windows.")
+# @pytest.mark.skipif(platform.system() in ("Windows", "Linux"), reason="Gui test is not working on windows.")
+@pytest.mark.skipif(platform.system() == "Windows", reason="Gui test is not working on windows.")
 def test_annotator_2d(make_napari_viewer_proxy):
     """Integration test for annotator_2d.
     """