Fixes #2267 and restores layout of production line tabs with multiple re...

This resolves the `horizons/gui/tabs/productiontabs.py` issues that was addressed in 97d3e5ababfced27370e7c07ebe9dc1dff39bdff where `in_res_container` and `out_res_container` were not searching for `input_res` and `output_res` in the same place which allowed one to succeed and the other to fail. They both need to search in container rather than centered_container due to the structure of the layout.