test_ddl_deparse: rename matview

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

Commit: a446a1c70f65c6c68598c2160b530606fa1b5c38
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2018-03-15T18:21:01Z
Releases: 11.0
test_ddl_deparse: rename matview

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

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