Fixed migration as Postgres does not support after statements

[xolf]

With running the migration on my Postgres database I received the following error message.

   INFO  Running migrations.  

  2025_01_31_075158_create_locations_table ............................................................................................ 14.01ms FAIL

   Illuminate\Database\QueryException 

  SQLSTATE[42601]: Syntax error: 7 ERROR:  syntax error at or near "after"
LINE 1: ...LTER TABLE locations ADD COLUMN center POINT NULL after is_c...
                                                             ^ (Connection: pgsql, Host: postgres, Port: 5432, Database: spreadly, SQL: ALTER TABLE locations ADD COLUMN center POINT NULL after is_capital)