styles: attempt to change link ripple effect

Does not work; it works if we use the style as a theme (????) but won't
correctly use the day/night colors then.

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

@@ -3,6 +3,4 @@
     android:id="@+id/text_view"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
-    style="@style/CometText"
-    android:textColor="@color/link"
-    android:textIsSelectable="false" />
+    style="@style/CometLink" />

app/src/main/res/values/styles.xml

@@ -9,4 +9,9 @@
         <item name="android:paddingBottom">4dp</item>
         <item name="android:textIsSelectable">true</item>
     </style>
+    <style name="CometLink" parent="CometText">
+        <item name="android:textColor">@color/link</item>
+        <item name="android:textIsSelectable">false</item>
+        <item name="android:background">?attr/selectableItemBackground</item>
+    </style>
 </resources>