Adjust error resilience test data rate.

Note that the pass fail criteria for this test seems a bit
arbitrary to me.

Change-Id: Idc695c39dd7542e851a7732b2810b45e0bdf91ae

test/error_resilience_test.cc

@@ -182,7 +182,7 @@ TEST_P(ErrorResilienceTest, OnVersusOff) {
 TEST_P(ErrorResilienceTest, DropFramesWithoutRecovery) {
   const vpx_rational timebase = { 33333333, 1000000000 };
   cfg_.g_timebase = timebase;
-  cfg_.rc_target_bitrate = 500;
+  cfg_.rc_target_bitrate = 1500;
 
   init_flags_ = VPX_CODEC_USE_PSNR;