Update pgsql.calendars.sql

[perguth]

Add missing primary key declaration.

[codecov]

Codecov Report

Merging #1317 (7fc2720) into master (71bbf40) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1317   +/-   ##
=========================================
  Coverage     97.35%   97.35%           
  Complexity     2809     2809           
=========================================
  Files           174      174           
  Lines          7976     7976           
=========================================
  Hits           7765     7765           
  Misses          211      211           

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[staabm]

ohh wow. @phil-davis @DeepDiver1975 is this something you could verify?

[phil-davis]

mysql.calendars.sql and sqlite.calendars.sql both have id defined as primary key for table schedulingobjects

The change here is the correct way to do this in pgsql, and was missing from this example code.