missed first_conv for rnv2 18d

Author: rwightman

timm/models/resnetv2.py

@@ -699,7 +699,7 @@ def _cfg(url='', **kwargs):
     'resnetv2_18.untrained': _cfg(
         interpolation='bicubic', crop_pct=0.95),
     'resnetv2_18d.untrained': _cfg(
-        interpolation='bicubic', crop_pct=0.95),
+        interpolation='bicubic', crop_pct=0.95, first_conv='stem.conv1'),
     'resnetv2_50.a1h_in1k': _cfg(
         hf_hub_id='timm/',
         interpolation='bicubic', crop_pct=0.95, test_input_size=(3, 288, 288), test_crop_pct=1.0),