pgsql: Type names should not be quoted

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

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/f402b9950120358d1870aacc10070e121d8a17de

Modified Files
--------------
src/backend/commands/amcmds.c               |  2 +-
src/backend/commands/conversioncmds.c       |  2 +-
src/backend/commands/event_trigger.c        |  2 +-
src/backend/commands/foreigncmds.c          |  2 +-
src/backend/commands/operatorcmds.c         |  4 ++--
src/backend/commands/proclang.c             |  4 ++--
src/backend/commands/trigger.c              |  2 +-
src/backend/commands/typecmds.c             | 20 ++++++++++----------
src/backend/parser/parse_clause.c           |  2 +-
src/test/regress/expected/event_trigger.out |  2 +-
10 files changed, 21 insertions(+), 21 deletions(-)