Codechange: Include table/strings.h in files that use StringIDs.

Be consistent with how and where the file is incldued.

src/script/api/script_sign.cpp

@@ -9,7 +9,6 @@
 
 #include "../../stdafx.h"
 #include "script_sign.hpp"
-#include "table/strings.h"
 #include "../script_instance.hpp"
 #include "../../signs_base.h"
 #include "../../string_func.h"
@@ -17,6 +16,8 @@
 #include "../../tile_map.h"
 #include "../../signs_cmd.h"
 
+#include "table/strings.h"
+
 #include "../../safeguards.h"
 
 /* static */ bool ScriptSign::IsValidSign(SignID sign_id)