Add: save openttd.cfg immediately on changing a setting (#8358)

Formally it was only done on exit. This means that if it crashes
changes in settings were not stored. This is often rather
frustrating. Additionally, targets (like emscripten) where people
are unlike to use "Exit Game", will never see their configuration
stored.

The drawback is that on every setting change there is some minor
I/O of writing the ini file to disk again.

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