Drop an unneeded London transaction instance check

Author: carver

eth/vm/forks/london/state.py

@@ -35,7 +35,6 @@
 )
 
 from .computation import LondonComputation
-from .transactions import LondonTypedTransaction
 from .validation import validate_london_normalized_transaction
 
 
@@ -180,18 +179,18 @@ def get_transaction_context(self: StateAPI,
         London-specific transaction context creation,
         where gas_price includes the block base fee
         """
-        if isinstance(transaction, LondonTypedTransaction):  # TODO probably do this somewhere else
-            priority_fee_per_gas = min(
-                transaction.max_priority_fee_per_gas,
-                transaction.max_fee_per_gas - self.execution_context.base_fee_per_gas
-            )
-        else:
-            priority_fee_per_gas = min(
-                transaction.gas_price,
-                transaction.gas_price - self.execution_context.base_fee_per_gas
-            )
+        effective_gas_price = min(
+            transaction.max_priority_fee_per_gas + self.execution_context.base_fee_per_gas,
+            transaction.max_fee_per_gas,
+        )
+        # See how this reduces in a pre-1559 transaction:
+        # 1. effective_gas_price = min(
+        #     transaction.gas_price + self.execution_context.base_fee_per_gas,
+        #     transaction.gas_price,
+        # )
+        # base_fee_per_gas is non-negative, so:
+        # 2. effective_gas_price = transaction.gas_price
 
-        effective_gas_price = self.execution_context.base_fee_per_gas + priority_fee_per_gas
         return self.get_transaction_context_class()(
             gas_price=effective_gas_price,
             origin=transaction.sender