Ensure map used for common map seeds is the same

[snowflav-goob]

By default, upstream Map Rando only tries a specific map for one or 10 generations, depending on settings.
Using the same map seed only guarantees that you'll be iterating over the same set of maps, instead of always getting one specific map. This meant that AP players using the common_map option could end up with a different map, depending on how many attempts their individual generations took.

This adds a specific case for generations where map_seed_ap is set by setting max_attempts_per_map equal to max_attempts, to ensure the map will not change, and therefore a same value of map_seed_map will guarantee the same map.