gh-133579: correctly report C curses errors in _curses_panel
#134629
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This was part of #125844 but I extracted it from there because it wasn't necessary. I'll make it part of gh-133579 instead of gh-125843 because the other one was more for curses module itself and this one is a follow-up (and also because I changed some exception types)
curses
C function failures #133579