We should add +180° to the FESOM2 native grid info on cmorization.

See:
https://github.com/WCRP-CMIP/Essential-Model-Documentation/issues/105#issuecomment-4172067173

> Field guidance
> westernmost_longitude
> 
> Domain western boundary
> 
> In degrees east **(0 to 360)**.
> 
> For global grids, typically 0 or first cell center longitude.