Restored green filters arrow, people seemed to prefer this to the current filters icon, which doesn't necessarily look like an actual button

astrid/res/drawable/tango_previous.xml

@@ -17,10 +17,10 @@
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
 
     <item android:state_pressed="false" android:state_enabled="true"
-          android:state_focused="false" android:drawable="@drawable/tango_filters_normal" />
+          android:state_focused="false" android:drawable="@drawable/tango_previous_normal" />
     <item android:state_pressed="true" android:state_enabled="true"
-          android:drawable="@drawable/tango_filters_pressed" />
+          android:drawable="@drawable/tango_previous_pressed" />
     <item android:state_pressed="false" android:state_enabled="true"
-          android:state_focused="true" android:drawable="@drawable/tango_filters_pressed" />
+          android:state_focused="true" android:drawable="@drawable/tango_previous_pressed" />
 
 </selector>

astrid/res/layout/task_list_activity.xml

@@ -20,7 +20,7 @@
             android:layout_width="wrap_content"
             android:layout_height="fill_parent"
             android:layout_weight="1"
-            android:src="@drawable/tango_filters"
+            android:src="@drawable/tango_previous"
             android:scaleType="center"
             android:paddingLeft="5dip" 
             android:paddingRight="5dip"/>