Added OpenBMC favicon.ico

The favicon.ico before was transparent.
Created the favicon.ico using https://www.favicon-generator.org/ and
a cropped OpenBMC logo image. The cropped OpenBMC image was only
the OpenBMC symbol. The image had the text underneath cropped out.
A favicon.ico based on the complete OpenBMC logo looked weird.
This change will not be visible if running the GUI locally, this
is due to how we display the favicon.
The complete OpenBMC logo can be found here:
https://en.wikipedia.org/wiki/OpenBMC#/media/File:OpenBMC_logo.png

Tested: Built a Witherspoon image and loaded it onto a
Witherspoon.
Change-Id: I284c75e303ae8a6e005a26e2fdb7362db7e2300f
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/app/assets/images/favicon.ico b/app/assets/images/favicon.ico
index 85a4d9f..6442605 100644
--- a/app/assets/images/favicon.ico
+++ b/app/assets/images/favicon.ico
Binary files differ