Remove: [Script] CONFIG_RANDOM from AddSetting flags (#11942)

It had a very weird interaction, and was only ever used by a single
AI.

src/script/api/ai_changelog.hpp

@@ -24,6 +24,7 @@
  *
  * API removals:
  * \li AIError::ERR_PRECONDITION_TOO_MANY_PARAMETERS, that error is never returned anymore.
+ * \li AIInfo::CONFIG_RANDOM, no longer used.
  *
  * Other changes:
  * \li AIGroupList accepts an optional filter function

src/script/api/game_changelog.hpp

@@ -90,6 +90,7 @@
  *
  * API removals:
  * \li GSError::ERR_PRECONDITION_TOO_MANY_PARAMETERS, that error is never returned anymore.
+ * \li AIInfo::CONFIG_RANDOM, no longer used.
  *
  * Other changes:
  * \li GSGroupList accepts an optional filter function

src/script/api/script_info_docs.hpp

@@ -203,7 +203,6 @@ public:
 	/** Miscellaneous flags for Script settings. */
 	enum ScriptConfigFlags {
 		CONFIG_NONE,      ///< Normal setting.
-		CONFIG_RANDOM,    ///< When randomizing the Script, pick any value between min_value and max_value (inclusive).
 		CONFIG_BOOLEAN,   ///< This value is a boolean (either 0 (false) or 1 (true) ).
 		CONFIG_INGAME,    ///< This setting can be changed while the Script is running.
 		CONFIG_DEVELOPER, ///< This setting will only be visible when the Script development tools are active.