game: Skip warmup on devmap

[Vorschreibung]

Assists in smoother/faster devmap cycles.

As is g_warmup is capped to at least 10 seconds.

[sonarcloud]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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[ryzyk-krzysiek]

If you would like to start directly on gamestate GS_PLAYING you should be able to do so with config.

g_customConfig test
File test.config

configname "^1This is test config"

init
{
	setl gamestate "0"
}