Fixed a couple of compile errors caused by the merge.

Author: conor10

Diff for: src/main/java/org/web3j/abi/Contract.java

@@ -132,7 +132,6 @@ public TransactionReceipt call() throws Exception {
                 return executeTransaction(function);
             }
         });
-        return result;
     }
 
     protected EventValues extractEventParameters(

Diff for: src/main/java/org/web3j/abi/ManagedTransaction.java

@@ -22,8 +22,8 @@
 public abstract class ManagedTransaction {
 
     // Sensible defaults as of November 2016...
-    public static final BigInteger GAS_PRICE = BigInteger.valueOf(50_000_000_000L);
-    public static final BigInteger GAS_LIMIT = BigInteger.valueOf(2_000_000);
+    public static final BigInteger GAS_PRICE = BigInteger.valueOf(50000000000L);
+    public static final BigInteger GAS_LIMIT = BigInteger.valueOf(2000000);
 
     private static final int SLEEP_DURATION = 15000;
     private static final int ATTEMPTS = 40;