patch 9.0.0634: evaluating "expr" options has more overhead than needed

Problem:    Evaluating "expr" options has more overhead than needed.
Solution:   Use call_simple_func() for 'foldtext', 'includeexpr', 'printexpr',
            "expr" of 'spellsuggest', 'diffexpr', 'patchexpr', 'balloonexpr',
            'formatexpr', 'indentexpr' and 'charconvert'.
diff --git a/src/if_ole.cpp b/src/if_ole.cpp
index e3e4cdb..9dc15fd 100644
--- a/src/if_ole.cpp
+++ b/src/if_ole.cpp
@@ -381,7 +381,7 @@
 
     /* Evaluate the expression */
     ++emsg_skip;
-    str = (char *)eval_to_string((char_u *)buffer, TRUE);
+    str = (char *)eval_to_string((char_u *)buffer, TRUE, FALSE);
     --emsg_skip;
     vim_free(buffer);
     if (str == NULL)