Update Android port

Update Android port

* doc/lispref/commands.texi (Misc Events): Document variable
`disable-inhibit-text-conversion'.
* java/org/gnu/emacs/EmacsDialog.java (display1): Try an
activity that is certain to be focused first.
* lisp/touch-screen.el (touch-screen-track-tap)
(touch-screen-track-drag): Bind
`disable-inhibit-text-conversion'.
* src/keyboard.c (read_key_sequence): Only disable text
conversion if an actual function or numeric key is found in the
key sequence.
(syms_of_keyboard): New variable
`disable-inhibit-text-conversion'.
* src/lread.c (read_filtered_event): Check new variable.
* src/textconv.c (textconv_query): Remove unused label.