(textsec-bidi-controls-suspicious-p): Minor tweak

* lisp/international/textsec.el (textsec-bidi-controls-suspicious-p):
Don't assume point-min==1 (and point-min is marginally more
efficient, to boot).

lisp/international/textsec.el

@@ -320,7 +320,8 @@ affected by bidi controls in STRING."
     ;; state at end of STRING which could then affect the following
     ;; text.
     (insert string "a1א:!")
-    (let ((pos (bidi-find-overridden-directionality 1 (point-max) nil)))
+    (let ((pos (bidi-find-overridden-directionality
+                (point-min) (point-max) nil)))
       (and (fixnump pos)
            (1- pos)))))