Remove unused image
Changes
--- app/assets/images/tab_bottom.gif d1090819a98ae89b19077943a81f74da3ff40840
+++ app/assets/images/tab_bottom.gif 959cf20a99b23626a13e3e2899271d1d4175895c
@@ -1,1 +1,0 @@
--- app/assets/images/tab_bottom.gif d1090819a98ae89b19077943a81f74da3ff40840
+++ app/assets/images/tab_bottom.gif 959cf20a99b23626a13e3e2899271d1d4175895c
@@ -1,1 +1,0 @@