scripted-diff: fix leftover references to policy/fees.h

-BEGIN VERIFY SCRIPT-
git grep -l "policy\/fees\.h" | xargs sed -i "s/policy\/fees.h/policy\/fees\/block_policy_estimator.h/g"
-END VERIFY SCRIPT-

test/functional/rpc_psbt.py

@@ -601,7 +601,7 @@ class PSBTTest(BitcoinTestFramework):
                 assert_raises_rpc_error(-3, f"JSON value of type {k} for field conf_target is not of expected type number",
                     self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {"estimate_mode": mode, "conf_target": v, "add_inputs": True})
             for n in [-1, 0, 1009]:
-                assert_raises_rpc_error(-8, "Invalid conf_target, must be between 1 and 1008",  # max value of 1008 per src/policy/fees.h
+                assert_raises_rpc_error(-8, "Invalid conf_target, must be between 1 and 1008",  # max value of 1008 per src/policy/fees/block_policy_estimator.h
                     self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {"estimate_mode": mode, "conf_target": n, "add_inputs": True})
 
         self.log.info("Test walletcreatefundedpsbt with too-high fee rate produces total fee well above -maxtxfee and raises RPC error")