Also set foreign key preferences when creating a new database

When opening a database we set the foreign key constraint checking
according to the preferences set in the Preferences Dialog. But when
creating a new database this wasn't done accordingly which means the
behaviour of the application is different depending on wether a database
was opened or newly created. This is changed by this commit.

src/sqlitedb.cpp

@@ -321,6 +321,12 @@ bool DBBrowserDB::create ( const QString & db)
 
     if (_db)
     {
+        // set preference defaults
+        QSettings settings(QApplication::organizationName(), QApplication::organizationName());
+        settings.sync();
+        bool foreignkeys = settings.value( "/db/foreignkeys", false ).toBool();
+        setPragma("foreign_keys", foreignkeys ? "1" : "0");
+
         // Enable extension loading
         sqlite3_enable_load_extension(_db, 1);