Fix some minor typos related with new Database class. (#2174)

resources/install/scripts/app/conference_center/index.lua

@@ -165,8 +165,7 @@
 			end_epoch = os.time();
 
 		--connect to the database
-			require "resources.functions.database_handle";
-			dbh = database_handle('system');
+			dbh = Database.new('system');
 
 		--get the conference sessions
 			if (conference_session_uuid) then

resources/install/scripts/app/ring_groups/resources/scripts/destination.lua

@@ -28,7 +28,7 @@
 
 --connect to the database
 	local Database = require "resources.functions.database";
-	dbh = database_handle('system');
+	dbh = Database.new('system');
 
 --include json library
 	local json

resources/install/scripts/app/voicemail/resources/scripts/mwi.lua

@@ -40,8 +40,8 @@
 	runonce = false;
 
 --connect to the database
-	require "resources.functions.database_handle";
-	dbh = database_handle('system');
+	local Database = require "resources.functions.database";
+	dbh = Database.new('system');
 
 --used to stop the lua service
 	local file = assert(io.open(run_file, "w"));

resources/install/scripts/recordings.lua

@@ -38,7 +38,7 @@
 
 --connect to the database
 	local Database = require "resources.functions.database";
-	dbh = database_handle('system');
+	dbh = Database.new('system');
 
 --include json library
 	local json