Assign "Identifier" attribute to opening double quote instead of "Comment"

Summary:
When the PostgreSQL syntax definition file was converted from using named attributes and contexts instead of numbers in this commit, the attribute for an opening double quote was incorrectly set to "Comment" instead of "Identifier". This patch fixes that.

BUG: 421445

Test Plan:
Incorrect opening double quote before fix:

Correct opening double quote after fix:

Reviewers: Framework: Syntax Highlighting, dhaumann

Reviewed By: Framework: Syntax Highlighting, dhaumann

Subscribers: cullmann, dhaumann, kwrite-devel, kde-frameworks-devel

Tags: Framework: Syntax Highlighting, Kate, Frameworks

Differential Revision: https://phabricator.kde.org/D29735