Attempt to fix TabError failures on CI

Author: krassowski

atest/05_Features/Completion.robot

@@ -149,8 +149,8 @@ VSCode Dark Theme Works
     Configure JupyterLab Plugin    {"theme": "vscode"}    plugin id=${COMPLETION PLUGIN ID}
     Capture Page Screenshot    01-configured.png
     Open ${file} in ${MENU NOTEBOOK}
-    Enter Cell Editor    1    line=2
     Wait Until Fully Initialized
+    Enter Cell Editor    1    line=2
     Trigger Completer
     Capture Page Screenshot    02-completions-shown.png
     Completer Should Suggest    TabError