Fix color of infinite blog loader

Change color from default accent to primary, to be consistent with other
loaders.

app/src/main/res/layout/blog_load_item.xml

@@ -10,5 +10,6 @@
         android:layout_height="wrap_content"
         android:layout_gravity="center_horizontal"
         android:layout_margin="@dimen/activity_vertical_margin"
-        android:indeterminate="true" />
+        android:indeterminate="true"
+        android:theme="@style/BlueAccent" />
 </LinearLayout>
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