Fix genshin_merge_mods.py

[jere344]

Fix merger for some mods like https://gamebanana.com/mods/454400

Not sure if you are interested in updating it, but the split("=", 1) especially fix a lot of mod using equal (== or !=) in the data.

Example error before fix :

Parsing ini sections
Calculating overrides and resources
Traceback (most recent call last):
  File "C:\Users\user\Desktop\genshin skin\3dmigoto-GIMI-for-playing-mods\3dmigoto\Mods\SmallKeqingMerge\original_merge_mod.py", line 396, in <module>
    main()
  File "C:\Users\user\Desktop\genshin skin\3dmigoto-GIMI-for-playing-mods\3dmigoto\Mods\SmallKeqingMerge\original_merge_mod.py", line 175, in main
    resources += f"[{all_mod_data[i]['header']}{all_mod_data[i]['name']}.{all_mod_data[i]['ini_group']}]\n"
KeyError: 'header'