Change the directory .speech-dispatcher to .cache/speech-dispatcher

[gordonwwang]

In the early days of submission ( 38d0c7f ), treat ~/.speech-dispatcher as the working directory for speech-dispatcher.
However, based on the recent documentation for speech-dispatcher, it seems that the default directory is "~/.cache/speech-dispatcher/".
doc link：https://htmlpreview.github.io/?https://github.com/brailcom/speechd/blob/master/doc/speech-dispatcher.html#Running-Under-Ordinary-Users-1

So I would like to discuss with you whether the directory in the userdom_filetrans_home_content function should be adjusted accordingly.
As shown in commit：#2098

[gordonwwang]

This issue has been replaced by #2100.
issue #2100 detailed tells the story of AVC researched - the dispatcher to refuse.