SQLite: Fix `copy_table` with composite primary keys
`connection.primary_key` also return composite primary keys, so `from_primary_key_column` may not be found even if `from_primary_key` is presented. ``` % ARCONN=sqlite3 be ruby -w -Itest test/cases/adapters/sqlite3/sqlite3_adapter_test.rb -n test_copy_table_with_composite_primary_keys Using sqlite3 Run options: -n test_copy_table_with_composite_primary_keys --seed 19041 # Running: E Error: ActiveRecord::ConnectionAdapters::SQLite3AdapterTest#test_copy_table_with_composite_primary_keys: NoMethodError: undefined method `type' for nil:NilClass /path/to/rails/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb:411:in `block in copy_table' ``` This change fixes `copy_table` to do not lose composite primary keys.
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