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GTK save_prefs: fix a wrongly sourced error report.

After a failed rename(), we should find out what went wrong by looking
in errno itself, not in wctx->error which reported a problem in the
previous step.

--- a/gtk.c

+++ b/gtk.c

@@ -3079,7 +3079,7 @@

     }

     if (rename(tmp_path, file_path) < 0) {

-        const char *os_err = strerror(wctx->error);

+        const char *os_err = strerror(errno);

         sprintf(err = snewn(256 + strlen(tmp_path) + strlen(file_path) +

                             strlen(os_err), char),

                 "Unable to save preferences:\n"