Fixing target_bitrate_bps for a FullStackTest

While refactoring, I incorrectly set the target bitrate for one of the tests to
500k instead of 2000k.

This does not fix all the perf regressions.

BUG=534220

Review URL: https://codereview.webrtc.org/1356123002

Cr-Original-Commit-Position: refs/heads/master@{#10008}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 1356ba5e6ceb7513137b4052f0c2f9edddb11d5e
diff --git a/video/full_stack.cc b/video/full_stack.cc
index 9ae0bd9..a11b799 100644
--- a/video/full_stack.cc
+++ b/video/full_stack.cc
@@ -107,7 +107,7 @@
 
 TEST_F(FullStackTest, ForemanCif1000kbps100msLimitedQueue) {
   VideoQualityTest::Params foreman_cif = {
-      {352, 288, 30, 30000, 500000, 2000000, "VP8", 1},
+      {352, 288, 30, 30000, 2000000, 2000000, "VP8", 1},
       {"foreman_cif"},
       {},
       {"foreman_cif_1000kbps_100ms_32pkts_queue", 0.0, 0.0,