Merge branch 'fix-blur' into 'master'

Fix blur on seekbar drawable

See merge request fdroid/fdroidclient!848

app/src/main/res/drawable-v23/seekbar_background.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:height="3dp" android:gravity="center_vertical">
+        <shape android:shape="rectangle">
+            <solid android:color="#818181" />
+        </shape>
+    </item>
+</layer-list>

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

@@ -44,7 +44,7 @@
              android:layout_below="@android:id/summary"
              android:layout_alignStart="@android:id/summary"
              android:layout_alignLeft="@android:id/summary"
-             android:progressDrawable="@drawable/seekbar_bg"
+             android:progressDrawable="@drawable/seekbar_background"
              android:thumb="@drawable/seekbar_thumb"
              android:padding="16dip"
              android:theme="@style/DiscreteSeekBar"/>