*: use "can't" instead of "cannot"

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

editors/vi.c

@@ -2335,7 +2335,7 @@ static int file_insert(const char *fn, char *p, int update_ro_status)
 	} else if (cnt < size) {
 		// There was a partial read, shrink unused space text[]
 		p = text_hole_delete(p + cnt, p + (size - cnt) - 1);	// un-do buffer insert
-		status_line_bold("cannot read all of file \"%s\"", fn);
+		status_line_bold("can't read all of file \"%s\"", fn);
 	}
 	if (cnt >= size)
 		file_modified++;