tests: simplify test box/access_mist.test.lua

Currently, the test shows all the data contained in the spaces
_func, _user and _space. This was added 6 years ago and is no
longer needed. In addition, this is inconvenient, as some data
changes every time bootstrap.snap is created. Due to this, we must
update the test result file every time we generate bootstrap.snap.
This patch removes the display of this data from the test.