remove unneeded references to old tables

[sheridancbio]

Describe changes proposed in this pull request:

• tables pdb_uniprot_alignment and pdb_uniprot_residue_mapping were removed at db version 2.12.12 there is no need to refer to them in cgds.sql or cgds-h2.sql
• whitespace standardization in migration.sql

These changes should have no semantic effect. When installing a new database schema there is no need to purge tables which should not be present and are not created.

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