[GH-225] Fix SQLServerPlatform adds unique constraint to ADD PRIMARY KEY statement

This issue is created automatically through a Github pull request on behalf of CraigMason:

Message:

Currently when executing an ALTER TABLE statement with SQL Server, the query will be:

This will happen when adding primary keys via ALTER TABLE.

`ALTER TABLE foo ADD PRIMARY KEY (id) WHERE id IS NOT NULL`

should be

`ALTER TABLE foo ADD PRIMARY KEY (id)`

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