patch 8.1.1901: the +insert_expand feature is not always available

Problem:    The +insert_expand feature is not always available.
Solution:   Graduate the +insert_expand feature.
diff --git a/src/change.c b/src/change.c
index 23c9587..ac2cc30 100644
--- a/src/change.c
+++ b/src/change.c
@@ -1008,10 +1008,7 @@
     // show the match for right parens and braces.
     if (p_sm && (State & INSERT)
 	    && msg_silent == 0
-#ifdef FEAT_INS_EXPAND
-	    && !ins_compl_active()
-#endif
-       )
+	    && !ins_compl_active())
     {
 	if (has_mbyte)
 	    showmatch(mb_ptr2char(buf));