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/beval.c b/src/beval.c
index 97fc354..375795e 100644
--- a/src/beval.c
+++ b/src/beval.c
@@ -278,7 +278,7 @@
 	current_sctx = curbuf->b_p_script_ctx[BV_BEXPR];
 
     vim_free(result);
-    result = eval_to_string(bexpr, TRUE);
+    result = eval_to_string(bexpr, TRUE, TRUE);
 
     // Remove one trailing newline, it is added when the result was a
     // list and it's hardly ever useful.  If the user really wants a