Fix the parameterization for the 20b model

Signed-off-by: John St. John <jstjohn@nvidia.com>

Author: jstjohn

bionemo-recipes/recipes/evo2_megatron/src/bionemo/evo2/models/evo2_provider.py

@@ -692,7 +692,7 @@ class Hyena20bModelProvider(HyenaModelProvider):
     rotary_base: int = 1_000_000
     seq_len_interpolation_factor: float = 128
     hyena_medium_conv_len: int = 128
-    hyena_short_conv_len: int = 3
+    hyena_short_conv_len: int = 7
     add_attn_proj_bias: bool = True