_cap_cup should never set _eol to True`

[eugulixes]

Such programs like vi may send something like \E[23;80H (set the vertical and horizontal positions of the cursor to y and x). The current implementation of cup will set _eol to True in this case and _echo will write a character on the next line. It's obviously a bug.

[dshil]

@eugulixes, but if the cursor is at the end of a line, where _echo should write a character?

[eugulixes]

@dshil, in my previous example the x and y values start from 1, so echo will put a character at the 80th position and then set _eol to True.