ivy.el (ivy-completing-read): Fix require-match arg being symbol

Do not cast them into boolean T values, since they change behaviour.

Fixes #2367

ivy.el

@@ -2413,7 +2413,7 @@ This interface conforms to `completing-read' and can be used for
 PROMPT is a string that normally ends in a colon and a space.
 COLLECTION is either a list of strings, an alist, an obarray, or a hash table.
 PREDICATE limits completion to a subset of COLLECTION.
-REQUIRE-MATCH is a boolean value.  See `completing-read'.
+REQUIRE-MATCH is a boolean value or a symbol.  See `completing-read'.
 INITIAL-INPUT is a string inserted into the minibuffer initially.
 HISTORY is a list of previously selected inputs.
 DEF is the default value.
@@ -2440,7 +2440,8 @@ INHERIT-INPUT-METHOD is currently ignored."
       (let ((str (ivy-read
                   prompt collection
                   :predicate predicate
-                  :require-match (and collection require-match)
+                  :require-match (when (and collection require-match)
+                                   require-match)
                   :initial-input (cond ((consp initial-input)
                                         (car initial-input))
                                        ((and (stringp initial-input)