Remove "Close session" from context menu
When terminal display's context menu opens above mouse cursor, this entry is really easy to click accidentally (mouse button down, move cursor 2 pixels, mouse button up) and in effect close the session. Moreover, the option is not really needed here. To close the session using mouse, user can click window's close button, use tab context menu, tab close button, or menu entry. Other tab/view-based applications (e.g. Chromium, Firefox, Kate) do not have close button in view context menu.
Edited by Nate Graham