Use spinner icon instead of arrow for feeditemlist buttons

res/layout/feeditemlist_item.xml

@@ -87,17 +87,19 @@
 
         <ImageButton
             android:id="@id/butAction"
-            android:layout_width="wrap_content"
-            android:layout_height="match_parent"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
             android:layout_alignParentRight="true"
-            android:layout_centerVertical="true"
+            android:layout_alignParentBottom="true"
             android:background="?attr/borderless_button"
             android:clickable="false"
             android:focusable="false"
             android:focusableInTouchMode="false"
-            android:padding="8dp"
-            android:scaleType="center"
-            android:src="?attr/navigation_expand" />
+            android:paddingLeft="16dp"
+            android:paddingRight="16dp"
+            android:paddingTop="16dp"
+            android:scaleType="centerCrop"
+            android:src="?attr/spinner_button" />
     </RelativeLayout>
 
 </LinearLayout>

res/values/attrs.xml

@@ -25,6 +25,7 @@
     <attr name="type_audio" format="reference" />
     <attr name="type_video" format="reference" />
     <attr name="borderless_button" format="reference" />
+    <attr name="spinner_button" format="reference" />
     <!-- Used in itemdescription -->
     <attr name="non_transparent_background" format="reference" />
     <attr name="video_overlay_background" format="color" />

res/values/styles.xml

@@ -29,6 +29,7 @@
         <item name="attr/non_transparent_background">@color/white</item>
         <item name="attr/borderless_button">@drawable/borderless_button</item>
         <item name="attr/video_overlay_background">@color/video_overlay_light</item>
+        <item name="attr/spinner_button">@drawable/spinner_button</item>
     </style>
 
     <style name="AntennaPod.LightTabPageIndicator" parent="Widget.TabPageIndicator">
@@ -63,6 +64,7 @@
         <item name="attr/non_transparent_background">@color/black</item>
         <item name="attr/borderless_button">@drawable/borderless_button_dark</item>
         <item name="attr/video_overlay_background">@color/video_overlay_dark</item>
+        <item name="attr/spinner_button">@drawable/spinner_button_dark</item>
     </style>
 
     <style name="AntennaPod.DarkTabPageIndicator" parent="Widget.TabPageIndicator">