stdout: use dim colors

Some of the bright colors (especially yellow & blue) are very hard to
see on a white terminal background. The dim colors are always visible,
so use those instead.

Bug: 60
Change-Id: I2a51ac60282054dc6998556182dfe83a490c4f66
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/4360
Reviewed-by: Daniel Bratell <bratell@opera.com>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Brett Wilson <brettw@chromium.org>

tools/gn/standard_out.cc

diff --git a/tools/gn/standard_out.cc b/tools/gn/standard_out.cc
index f74b9ab..3056418 100644
--- a/tools/gn/standard_out.cc
+++ b/tools/gn/standard_out.cc
@@ -181,7 +181,7 @@
         WriteToStdOut("\e[34m\e[1m");
         break;
       case DECORATION_YELLOW:
-        WriteToStdOut("\e[33m\e[1m");
+        WriteToStdOut("\e[33m");
         break;
     }
   }