arni-detail: incorrect frequency

[gmwe]

@Grommetox @matt3o

setup:

roslaunch arni_core test_1_steady.launch

will have one publisher on /forest with ~100Hz

rqt

and opening arni-details

bug description

/statistics_rated shows:

seuid: t!/forest
[...]
    statistic_type: frequency
    actual_value: ['99.9440327908']
    expected_value: ['[80, 120]']
    state: [3]
  - 
    statistic_type: alive
    actual_value: ['True']
    expected_value: ['True']
    state: [2]

~100Hz, which is correct.

While arni-details shows is between 200Hz and 300Hz but should also be around 100Hz.

[gmwe]

Fixed in 33f79222a4bfff5b0927cfeb481ac6673b1af954.