* lisp/comint.el: Fix understickiness of non-comint properties

* lisp/comint.el: Fix understickiness of non-comint properties

When a third party package adds properties to the prompt they don't
necessarily want to be `read-nonsticky` (e.g. for the `cursor-intangible`
property), so replace the catchall `rear-nonsticky t` with an
actual list of the properties that we want to be `rear-nonsticky`.

(comint-send-input, comint-output-filter): Don't mark
all properties as non-sticky.