Include the map vote config file (#87867)

## About The Pull Request

Includes the map_vote.txt config file created in
https://github.com/tgstation/tgstation/pull/86788 so that it gets read
when the server starts.

## Why It's Good For The Game

Reads whatever value is set in the config file.

config/config.txt

@@ -8,6 +8,7 @@ $include resources.txt
 $include interviews.txt
 $include lua.txt
 $include auxtools.txt
+$include map_vote.txt
 
 # You can use the @ character at the beginning of a config option to lock it from being edited in-game
 # Example usage: