Include _resize_pipe_rd in fd_list for _wait_for_input_ready for raw_display

[inducer]

Checklist

• I've ensured that similar functionality has not already been implemented
• I've ensured that similar functionality has not earlier been proposed and declined
• I've branched off the master or python-dual-support branch
• I've merged fresh upstream into my branch recently
• I've ran tox successfully in local environment
• I've included docstrings and/or documentation and/or examples for my code (if this is a new feature)

Description:

This addresses inducer/pudb#421 (at least for the raw display). Pudb uses its own main loop, and I noticed that it didn't receive events for window resizes, instead receiving those only on the next key press.

[coveralls]

Coverage decreased (-0.7%) to 77.138% when pulling 228ffee on inducer:sigwinch-raw-wait-for-input into 4c739b6 on urwid:master.

[wookayin]

Dear maintainers, a gentle reminder of this! It'd be great if this can be merged sooner than later. /cc @ulidtko

[wookayin]

Any updates?