Use copied

Now we have Rust 1.31 we can use `copied`. Clears clippy warning.

Author: tcharding

src/miniscript/satisfy.rs

@@ -168,7 +168,7 @@ impl<Pk: MiniscriptKey + ToPublicKey> Satisfier<Pk> for After {
 
 impl<Pk: MiniscriptKey + ToPublicKey> Satisfier<Pk> for HashMap<Pk, bitcoin::EcdsaSig> {
     fn lookup_ecdsa_sig(&self, key: &Pk) -> Option<bitcoin::EcdsaSig> {
-        self.get(key).map(|x| *x)
+        self.get(key).copied()
     }
 }
 
@@ -180,7 +180,7 @@ impl<Pk: MiniscriptKey + ToPublicKey> Satisfier<Pk>
         // If we change the signature the of lookup_tap_leaf_script_sig to accept a tuple. We would
         // face the same problem while satisfying PkK.
         // We use this signature to optimize for the psbt common use case.
-        self.get(&(key.clone(), *h)).map(|x| *x)
+        self.get(&(key.clone(), *h)).copied()
     }
 }
 

src/psbt/mod.rs

@@ -262,7 +262,7 @@ impl<'psbt, Pk: MiniscriptKey + ToPublicKey> Satisfier<Pk> for PsbtInputSatisfie
         self.psbt.inputs[self.index]
             .tap_script_sigs
             .get(&(pk.to_x_only_pubkey(), *lh))
-            .map(|x| *x) // replace by copied in 1.36
+            .copied()
     }
 
     fn lookup_tap_control_block_map(
@@ -289,7 +289,7 @@ impl<'psbt, Pk: MiniscriptKey + ToPublicKey> Satisfier<Pk> for PsbtInputSatisfie
         self.psbt.inputs[self.index]
             .partial_sigs
             .get(&pk.to_public_key())
-            .map(|sig| *sig)
+            .copied()
     }
 
     fn lookup_pkh_ecdsa_sig(