fix beit model converter (open-mmlab#1616)

* fix beit model converter

* Update beit2mmseg.py

I have modified the code according to your suggestion. Thanks.

Author: ZhaoYi1222

tools/model_converters/beit2mmseg.py

@@ -12,9 +12,6 @@ def convert_beit(ckpt):
     new_ckpt = OrderedDict()
 
     for k, v in ckpt.items():
-        if k.startswith('patch_embed'):
-            new_key = k.replace('patch_embed.proj', 'patch_embed.projection')
-            new_ckpt[new_key] = v
         if k.startswith('blocks'):
             new_key = k.replace('blocks', 'layers')
             if 'norm' in new_key:
@@ -24,6 +21,9 @@ def convert_beit(ckpt):
             elif 'mlp.fc2' in new_key:
                 new_key = new_key.replace('mlp.fc2', 'ffn.layers.1')
             new_ckpt[new_key] = v
+        elif k.startswith('patch_embed'):
+            new_key = k.replace('patch_embed.proj', 'patch_embed.projection')
+            new_ckpt[new_key] = v
         else:
             new_key = k
             new_ckpt[new_key] = v