* lisp/wdired.el: Clean out isearch-filter-predicate (bug#37496)
* lisp/wdired.el (wdired-change-to-dired-mode): Use remove-function to remove wdired-isearch-filter-read-only (whose value was added in wdired-change-to-wdired-mode) from local value of isearch-filter-predicate.