Fix database upgrades 38, 39, 40.

Ensure the changes are applied to the public schema.

etc/db/upgrades/upgrade38-v0.6.0-add-keystore-table.sql

@@ -38,6 +38,7 @@ CREATE OR REPLACE PROCEDURE pg_temp.upgrade_database () AS $outer$
 BEGIN
 
 	RAISE NOTICE 'Updating schema %', 'public';
+	SET search_path TO public;
 
 	CREATE TABLE IF NOT EXISTS keystore (
 		type TEXT NOT NULL,     -- A class of data to be stored

etc/db/upgrades/upgrade39-v0.6.1-add-default-user.sql

@@ -41,6 +41,7 @@ CREATE OR REPLACE PROCEDURE pg_temp.upgrade_database () AS $outer$
 BEGIN
 
 	RAISE NOTICE 'Updating schema %', 'public';
+	SET search_path TO public;
 
 	INSERT INTO keystore (type, key, data)
 	VALUES ('user', '6f1e7159-4ca0-4ae4-ab4e-89078166cc10', '

etc/db/upgrades/upgrade40-v0.6.2-add-default-project-organisations.sql

@@ -46,6 +46,7 @@ CREATE OR REPLACE PROCEDURE pg_temp.upgrade_database () AS $outer$
 BEGIN
 
 	RAISE NOTICE 'Updating schema %', 'public';
+	SET search_path TO public;
 
 	-- Add "organisations" section to configurations, if not already present
 	UPDATE projects