nk_xcb_init: no xcb window title

[beatwise]

nk_xcb_init doesn't set the window title.

This sets the title (see https://xcb.freedesktop.org/windowcontextandmanipulation/ ):

xcb_change_property(conn, XCB_PROP_MODE_REPLACE, window, XCB_ATOM_WM_NAME, XCB_ATOM_STRING, 8, strlen(title), title);

[riri]

PR welcome if you already know how to fix it

[beatwise]

To fix it, simply add the code i wrote after xcb_create_window.