Only call Blind in_pool for matching blind types

[mleaf233]

Additional Info:

• I didn't modify api's or I've made a PR to the wiki repo.
• I didn't modify api's or I've updated lsp definitions.
• I didn't make new lovely files or all new lovely files have appropriate priority.

When generating a small or big blind pool, boss-only blinds were still having their in_pool callbacks executed even
though they could never enter that pool. This can trigger side effects or crashes in mods whose boss blind in_pool
logic assumes it is being checked for the boss pool.

The return value from type-mismatched in_pool calls was already ignored by if not v[blind_type], so this should not
change valid pool membership. It only avoids calling in_pool for blinds that cannot be part of the requested pool.

This changes SMODS.create_blind_pool so SMODS.add_to_pool(v) is only called after confirming the blind supports
the requested blind_type.

Before:

  local res, options = SMODS.add_to_pool(v)
  if not v[blind_type] then

After:

  if v[blind_type] then
      local res, options = SMODS.add_to_pool(v)

The existing branch order is preserved:

• boss_already_chosen
• options.ignore_showdown_check
• blind_type == 'boss'
• small/big normal checks