test_ddl_deparse: rename matview

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 12bcecae10f7986407fedeb3dd795556027a9d96
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2018-03-15T18:21:32Z
Releases: 10.4
test_ddl_deparse: rename matview

Should have done this in e69f5e0efca ...
Per note from Tom Lane.

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