Fix tests regarding contract type conversion.

test/libsolidity/SolidityEndToEndTest.cpp

@@ -9428,7 +9428,7 @@ BOOST_AUTO_TEST_CASE(failed_create)
 				if (depth < 1024)
 					return this.stack(depth - 1);
 				else
-					return f(0);
+					return address(f(0));
 			}
 		}
 	)";

test/libsolidity/syntaxTests/constructor/inconstructible_internal_constructor_inverted.sol

@@ -7,6 +7,7 @@ contract B {
 	}
 }
 contract A {
-	constructor(address) public {}
+	constructor(address) internal {}
 }
 // ----
+// TypeError: (141-146): Contract with internal constructor cannot be created directly.