bug#34517: tmm menubar menu items have no effect on Android

[Juri Linkov]

found 34517 26.1
fixed 34517 27.0.50
quit

> Touching the top menu items like “File” opens a file submenu nicely
> in tmm's *Completions* buffer.
>
> But touching menu items in its submenu like “New Window on Right”
> does nothing.

I noticed that mouse clicks fail even with xterm-mouse-mode,
so looked again at the problem and fixed it in master by
avoiding inserting initial value to the minibuffer.
Also moved the list of pre-populated menu items to the
list of default values for M-n.  And due to the tradition
of reversing completions in tmm-km-list every release,
reversed it once more.