remove default pfee strategy

Author: HardhatChad

src/main.rs

@@ -134,7 +134,6 @@ struct Args {
         long,
         value_name = "DYNAMIC_FEE_STRATEGY",
         help = "Strategy to use for dynamic fee estimation. Must be one of 'helius', or 'triton'.",
-        default_value = "helius",
         global = true
     )]
     dynamic_fee_strategy: Option<String>,