Update 3.4.0-2014-09-16.sql

I added a missing space. Without it you get a sql error message in Extension manager -> Database:
Database query failed (error # %s): %s SQL=ALTER TABLE "n6pbh_redirect_links" ADD COLUMN "header"INTEGER DEFAULT 301 NOT NULL;
Merge pull request #4920 from waader/patch-1

Missing space in Postgres Update 3.4.0-2014-09-16.sql