libcutils: fix socket type in SocketsTest.TestGetLocalPort

With -Wall enabled locally, clang points out that the second parameter
to socket_inaddr_any_server() was accidentally hard-coded:

system/core/libcutils/tests/sockets_test.cpp:103:18: warning: unused variable 'type' [-Wunused-variable]
        for (int type : {SOCK_DGRAM, SOCK_STREAM}) {
                 ^

Bug: 26936282
Test: mmm system/core/libcutils/tests
Test: adb shell /data/nativetest/libcutils_test/libcutils_test32 \
	--gtest_filter=SocketsTest.TestGetLocalPort (on hikey)
Test: adb shell /data/nativetest64/libcutils_test/libcutils_test64 \
        --gtest_filter=SocketsTest.TestGetLocalPort (on hikey)

Change-Id: Ib0fa24fb02a5ee14db0afd6591a62089e43bbec0
Signed-off-by: Greg Hackmann <ghackmann@google.com>