* eat.el (eat--t-eol, eat--t-reset, eat--t-erase-in-disp)
(eat--t-disable-alt-disp, eat--t-resize, eat-term-redisplay)
(eat-term-input-event, eat--adjust-process-window-size): Use
'let' instead of 'let*' wherever possible.
* eat.el (eat--eshell-exec-visual): Use (VAR nil) form instead
of VAR form in 'let*' variable list.
* eat.el (eat-term-input-event): Use USE-WINDOW argument of
'posn-col-row' to support text scaling properly, but only on
Emacs >= 29 since on Emacs 28 'posn-col-row' takes only one
argument.
