patch 8.2.4179: 'foldtext' is evaluated in the current script context

Problem:    'foldtext' is evaluated in the current script context.
Solution:   Use the script context where the option was set.
diff --git a/src/findfile.c b/src/findfile.c
index 110e06b..3a64845 100644
--- a/src/findfile.c
+++ b/src/findfile.c
@@ -2097,7 +2097,7 @@
 
     set_vim_var_string(VV_FNAME, ptr, len);
     res = eval_to_string_safe(curbuf->b_p_inex,
-		      was_set_insecurely((char_u *)"includeexpr", OPT_LOCAL));
+		was_set_insecurely((char_u *)"includeexpr", OPT_LOCAL), FALSE);
     set_vim_var_string(VV_FNAME, NULL, 0);
     return res;
 }