Invert signed-in and signed-out background colors

Most users work in the signed-in mode when reading source files
during review. Using the white background makes it easier to read
the text, especially with syntax coloring enabled.

Change-Id: If49aa62c0ff26971c64fd75505265c58ac859062
Signed-off-by: Shawn O. Pearce <sop@google.com>
2 files changed