Revert: "Change: Allow AI companies to start immediately."

This reverts commit 011257dc88.

This commit was not working properly. Attempts are made to fix it,
but so close to 1.9, it sounds a lot better to revert it from the
1.9 branch, and keep developing it further in 1.10.

src/script/script_config.hpp

@@ -139,7 +139,7 @@ public:
 	/**
 	 * Randomize all settings the Script requested to be randomized.
 	 */
-	virtual void AddRandomDeviation();
+	void AddRandomDeviation();
 
 	/**
 	 * Is this config attached to an Script? In other words, is there a Script