[ATR-29725] Update AODSLIM steering logic in TrigNavSlimmingMTConfig.py

Changes the logic for AOD trigger navigation slimming, go from "if AODFULL, else other" to "if AODSLIM, else other"

This is because we now produce AODs with ESD-level trigger payload. These files should not have the AODSLIM level of navigation slimming applied, and overall it is better if we explicitly test for this slimming level.

There are currently not any additional differences in the navigation slimming between ESD level output and AODFULL level output.

Expected to fix ATR-29725, but currently untested.