[Model] Fix bug of gatv2 when input is block (#5000)

Co-authored-by: Ubuntu <ubuntu@ip-172-31-16-19.ap-northeast-1.compute.internal>

python/dgl/nn/pytorch/conv/gatv2conv.py

@@ -294,11 +294,11 @@ class GATv2Conv(nn.Module):
                 if self.share_weights:
                     feat_dst = feat_src
                 else:
-                    feat_dst = self.fc_dst(h_src).view(
+                    feat_dst = self.fc_dst(h_dst).view(
                         -1, self._num_heads, self._out_feats
                     )
                 if graph.is_block:
-                    feat_dst = feat_src[: graph.number_of_dst_nodes()]
+                    feat_dst = feat_dst[: graph.number_of_dst_nodes()]
                     h_dst = h_dst[: graph.number_of_dst_nodes()]
             graph.srcdata.update(
                 {"el": feat_src}