Fix: Don't lower tree density if spreading is not enabled #8413
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I started this in #8160 but apparently, it wasn't good enough as even though it prevented forests from disappearing completely they still thin out after a while which is undesirable, especially in realistic scenarios with custom tree density.
It may not be the best example (aka worst case) but still enough to illustrate the issue:
After map generation:
Current behaviour:
With this PR:
Savegame used for testing:
tree-test.tar.gz