schema_tables: make gratuitous generic lambda in merge_tables_and_views() concrete
schema_tables: make gratuitous generic lambda in merge_tables_and_views() concrete

The generic lambda made IDE searches for create_table_from_mutations fail.
Message-Id: <6f16eb0e4b7e9795a1c2e5bf998c74726324bbfd@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla