[partition] offer /boot also when other EFI partition was specified

- it still makes sense to offer /boot in EFI
- example: /boot ext4, /boot/efi vfat
- this partly reverts 60f8a7c5

src/modules/partition/gui/PartitionDialogHelpers.cpp

@@ -23,15 +23,11 @@
 QStringList
 standardMountPoints()
 {
-    QStringList mountPoints { "/", "/home", "/opt", "/srv", "/usr", "/var" };
+    QStringList mountPoints { "/", "/boot", "/home", "/opt", "/srv", "/usr", "/var" };
     if ( PartUtils::isEfiSystem() )
     {
         mountPoints << Calamares::JobQueue::instance()->globalStorage()->value( "efiSystemPartition" ).toString();
     }
-    else
-    {
-        mountPoints << QStringLiteral( "/boot" );
-    }
     mountPoints.removeDuplicates();
     mountPoints.sort();
     return mountPoints;