Fix CREATE VIEW IF NOT EXISTS test

And also tweak the Postgres definition.

Although IF NOT EXISTS only works for MATERIALIZED view, it'll
be simpler to test when we also support IF NOT EXISTS for normal views.

src/languages/postgresql/postgresql.formatter.ts

@@ -27,7 +27,7 @@ const reservedClauses = expandPhrases([
   'SET',
   // Data definition
   'CREATE [OR REPLACE] [TEMP | TEMPORARY] [RECURSIVE] VIEW',
-  'CREATE MATERIALIZED VIEW [IF NOT EXISTS]',
+  'CREATE [MATERIALIZED] VIEW [IF NOT EXISTS]',
   // other
   'RETURNING',
 ]);

test/features/createView.ts

@@ -59,9 +59,12 @@ export default function supportsCreateView(
   }
 
   if (ifNotExists) {
-    it('formats short CREATE TABLE IF NOT EXISTS', () => {
-      expect(format('CREATE TABLE IF NOT EXISTS tbl (a INT PRIMARY KEY, b TEXT);')).toBe(dedent`
-        CREATE TABLE IF NOT EXISTS tbl (a INT PRIMARY KEY, b TEXT);
+    it('formats short CREATE VIEW IF NOT EXISTS', () => {
+      expect(format('CREATE VIEW IF NOT EXISTS my_view AS SELECT 42;')).toBe(dedent`
+        CREATE VIEW IF NOT EXISTS
+          my_view AS
+        SELECT
+          42;
       `);
     });
   }