[gparted] Prefer enum to string comparison in set_partition_type()

[Curtis Gedak <gedakc src gnome org>]

commit 8ea0b7ef13c113ee04730821353743fea902aaf1
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Sat Apr 13 13:03:16 2019 +0100

    Prefer enum to string comparison in set_partition_type()

 src/GParted_Core.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/GParted_Core.cc b/src/GParted_Core.cc
index fa3261ea..0f547b89 100644
--- a/src/GParted_Core.cc
+++ b/src/GParted_Core.cc
@@ -3558,7 +3558,7 @@ bool GParted_Core::set_partition_type( const Partition & partition, OperationDet
                        // Actually MBR 07 IFS (Microsoft Installable File System) or
                        // GPT BDP (Windows Basic Data Partition).
                        // Ref: https://serverfault.com/a/829172
-                       if ( ! lp_fs_type && fs_type == "udf" )
+                       if (! lp_fs_type && partition.filesystem == FS_UDF)
                                lp_fs_type = ped_file_system_type_get( "ntfs" );
 
                        // default is Linux (83)