[hotfix] Grassim 'Plants' missing init attributions

Summary

Plants class constructor __init__() is missing

self.grid = grid
self.pft_composition = pft_composition
self.inits = inits
self.kc_values = kc_values
self.pft_values = pft_values
self.variables_to_save = variables_to_save

Steps to reproduce

run main.py with using any grassim configuration. ex :

crop_config = YAML_Inputs_provider(file='grassim_example.yml', subpath=os.path.join('CROPS', 'config')).inputs

Example Project

What is the current bug behavior?

Simulation does not run because self.pft_values is used before assignment

What is the expected correct behavior?

Simulation runs

Relevant logs and/or screenshots

(Paste any relevant logs - use code blocks (```) to format console output, logs, and code, as it's very hard to read otherwise.)

Possible fixes

Add to Plants __init__() :

self.grid = grid
self.pft_composition = pft_composition
self.inits = inits
self.kc_values = kc_values
self.pft_values = pft_values
self.variables_to_save = variables_to_save

/cc @project-manager