Type names should not be quoted

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

Commit: f402b9950120358d1870aacc10070e121d8a17de
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2016-04-01T16:35:48Z
Releases: 9.6.0
Type names should not be quoted

Our actual convention, contrary to what I said in 59a2111b23f, is not to
quote type names, as evidenced by unquoted use of format_type_be()
result value in error messages.  Remove quotes from recently tweaked
messages accordingly.

Per note from Tom Lane

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