Consider selecting close field after auto-copying

[matthayes]

From @rwmpelstilzchen:

If I remember correctly, the old behaviour was that if the cloze field was empty and you used the shortcut it would not only copy the plain field but also select the content of the cloze field. This enabled the user to hit the shortcut again and have the whole field as a cloze. IMHO it is very handy, but the new behaviour only copies the content.