Use a higher-resolution ReviewIt logo

The PNG was rastered with Gimp from diffymute.svg [1]. It also removes the
app's name from the logo, but that is probably fine as it still was the
old "Review It!?" name, and rendering the correct "app_name" text to a
background drawable is quite a bit of work.

[1] https://groups.google.com/d/msg/repo-discuss/nLCvwG2POpM/ENLsQX3ldugJ

Change-Id: I5d973452e17e9e68992b406d33417c63d5cf9233
diff --git a/app/src/main/res/drawable/review_it_logo.png b/app/src/main/res/drawable/review_it_logo.png
index 97c2f8a..7c697fe 100644
--- a/app/src/main/res/drawable/review_it_logo.png
+++ b/app/src/main/res/drawable/review_it_logo.png
Binary files differ