Quotation conflict with Postgres

Postgres was reading "private" as a column.

 - Error given - 
SQLSTATE[42703]: Undefined column: 7 ERROR: column "public" does not exist LINE 1: ... id, title, menu_title from _webpage where access = "public"

 When I switched the quote types around (see commit), that fixed the issue. I cannot confirm whether this interferes with other DB systems (like MySQL).

Issue was discovered when user was in the navigation/admin handler with no custom pages being listed while the site uses PostgreSQL.