screenrecord should default to '--bit-rate 20M'

Fixes: 64498022
Test: Flashed build to device and ensured bitrate was 20M
Change-Id: I06b8d4051c4e97c441a1d21d8018ad29b308d858
diff --git a/cmds/screenrecord/screenrecord.cpp b/cmds/screenrecord/screenrecord.cpp
index de0167a..bc32bbe 100644
--- a/cmds/screenrecord/screenrecord.cpp
+++ b/cmds/screenrecord/screenrecord.cpp
@@ -78,7 +78,7 @@
 static bool gWantFrameTime = false;     // do we want times on each frame?
 static uint32_t gVideoWidth = 0;        // default width+height
 static uint32_t gVideoHeight = 0;
-static uint32_t gBitRate = 4000000;     // 4Mbps
+static uint32_t gBitRate = 20000000;     // 20Mbps
 static uint32_t gTimeLimitSec = kMaxTimeLimitSec;
 
 // Set by signal handler to stop recording.