The default value of embedded preedit cursor

[utuhiro78]

I found your tweets.
https://twitter.com/shela_/status/1463472051335753735

I think "false" is better for the default value of "Fix embedded preedit cursor".

src/unix/fcitx5/mozc_engine.h:

-        _("Fix embedded preedit cursor at the beginning of the preedit"), true};
+        _("Fix embedded preedit cursor at the beginning of the preedit"), false};