esh-mode.el: Refrain from hiding buffer modifications (bug#70966)

esh-mode.el: Refrain from hiding buffer modifications (bug#70966)

We have not been able to discover why these functions let-bound
`inhibit-modification-hooks`, but these let-bindings are
undesired effects on other modes such as `diff-mode` which
need to keep track of buffer modifications.  Let's remove those
let-bindings and hope for the best.

* lisp/eshell/esh-mode.el (eshell-send-input)
(eshell-interactive-filter): Don't bind `inhibit-modification-hooks`.