UI: No longer in replace mode when exiting the FakeVim mode

src/UI/ScriptDocumentView.cc

@@ -70,6 +70,7 @@ ScriptDocumentView::setUseFakeVimEditor(bool yes) noexcept
             delete proxy;
 
         clearUndoRedo(editor);
+        editor->setOverwriteMode(false);
         isUsingFakeVim = false;
         proxy          = nullptr;
         handler        = nullptr;