Prefer oddp/evenp to open-coding in a few more cases

Prefer oddp/evenp to open-coding in a few more cases

* lisp/arc-mode.el (archive-zip-summarize):
* lisp/cus-edit.el (setopt):
* lisp/isearch.el (isearch-backslash):
* lisp/simple.el (blink-paren-post-self-insert-function):
* lisp/subr.el (setq-local, buffer-local-set-state):
* lisp/term.el (term-within-quotes):
* test/src/data-tests.el (test-bool-vector-bv-from-hex-string): Use
oddp/evenp instead of open-coding them.
Reported by Pip Cet <pipcet@protonmail.com>.

(cherry picked from commit 515542b653c438014eda844eacc96cf23cfaaa2d)