Remove image_encoder.py and update configuration_dpt.py

Removes the unused image_encoder.py file and uploads configuration_dpt.py.

configuration_dpt.py

@@ -26,7 +26,6 @@ class TIPSv2DPTConfig(PretrainedConfig):
         num_depth_bins=256,
         min_depth=1e-3,
         max_depth=10.0,
-        semantic_loss_ignore_index=255,
         **kwargs,
     ):
         super().__init__(**kwargs)