Fix constructor order in unit tests (sanitizer)

The WithParamTest constructor needs to be called first, as the
EncoderTest constructor is called with 'GET_PARAM'.

BUG=aomedia:580

Change-Id: I17f3c02c0a0eec103fb3505301b5eb6dfdef851c
diff --git a/test/tile_independence_test.cc b/test/tile_independence_test.cc
index a29051f..d28cb1f 100644
--- a/test/tile_independence_test.cc
+++ b/test/tile_independence_test.cc
@@ -22,8 +22,8 @@
 
 namespace {
 class TileIndependenceTest
-    : public ::libaom_test::EncoderTest,
-      public ::libaom_test::CodecTestWith2Params<int, int> {
+    : public ::libaom_test::CodecTestWith2Params<int, int>,
+      public ::libaom_test::EncoderTest {
  protected:
   TileIndependenceTest()
       : EncoderTest(GET_PARAM(0)), md5_fw_order_(), md5_inv_order_(),