[Toybox] [PATCH] microcom: Don't crash if failed to open paste file

[Yi-Yo Chiang]

* When running the "paste" command and failed to open the paste file
  (such as file not found or permission error), don't crash the entire
  microcom program. Instead print the error message and give the user a
  chance to fix the problem.
* If "paste" command is cancelled by "ESC" or an empty file name, clear
  the hanging "Filename:" prompt before returning to the main loop.

-- 

Yi-yo Chiang
Software Engineer
yochiang at google.com
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