Don't set isearch-success in isearch-wrap functions

* lisp/comint.el (comint-history-isearch-wrap):
* lisp/simple.el (minibuffer-history-isearch-wrap):
Don't set isearch-success to t, so isearch-repeat won't skip the
beginning of the wrapped match with (forward-char (if isearch-forward 1 -1)).

lisp/comint.el

@@ -1627,7 +1627,6 @@ or to the last history element for a backward search."
   (if isearch-forward
       (comint-goto-input (1- (ring-length comint-input-ring)))
     (comint-goto-input nil))
-  (setq isearch-success t)
   (goto-char (if isearch-forward (comint-line-beginning-position) (point-max))))
 
 (defun comint-history-isearch-push-state ()

lisp/isearch.el

@@ -1887,8 +1887,6 @@ Use `isearch-exit' to quit without signaling."
                 (setq count (1+ count)) ;; Increment to force repeat
                 (setq isearch-wrapped t)
                 (if isearch-wrap-function
-                    ;; Note that some wrap functions change the value of
-                    ;; isearch-success, so it's handled above before this call.
                     (funcall isearch-wrap-function)
                   (goto-char (if isearch-forward (point-min) (point-max)))))))
            ;; Stop looping on failure

lisp/simple.el

@@ -2798,7 +2798,6 @@ or to the last history element for a backward search."
   (if isearch-forward
       (goto-history-element (length (minibuffer-history-value)))
     (goto-history-element 0))
-  (setq isearch-success t)
   (goto-char (if isearch-forward (minibuffer-prompt-end) (point-max))))
 
 (defun minibuffer-history-isearch-push-state ()