scripted-diff: [validation] Rename CheckInputs to CheckInputScripts

CheckInputs() used to check no double spends, scripts & sigs and amounts. Since
832e0744cb, the double spend and amount checks
have been moved to CheckTxInputs(), and CheckInputs() now just validates
input scripts. Rename the function to CheckInputScripts().

-BEGIN VERIFY SCRIPT-
sed -i -E -e 's/CheckInputs\b/CheckInputScripts/g' $(git grep -l CheckInputs | grep -v doc/)
-END VERIFY SCRIPT-

test/functional/feature_dersig.py

@@ -120,7 +120,7 @@ class BIP66Test(BitcoinTestFramework):
         block.rehash()
         block.solve()
 
-        with self.nodes[0].assert_debug_log(expected_msgs=['CheckInputs on {} failed with non-mandatory-script-verify-flag (Non-canonical DER signature)'.format(block.vtx[-1].hash)]):
+        with self.nodes[0].assert_debug_log(expected_msgs=['CheckInputScripts on {} failed with non-mandatory-script-verify-flag (Non-canonical DER signature)'.format(block.vtx[-1].hash)]):
             self.nodes[0].p2p.send_and_ping(msg_block(block))
             assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
             self.nodes[0].p2p.sync_with_ping()