Move "Delete sweep" out from overflow (#5392)

Places it as its own icon, having an overflow with only one item doesn't make much sense when that's not the behavior in other parts of the app.

app/src/main/res/drawable/ic_delete_sweep_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@android:color/black"
+        android:pathData="M15,16h4v2h-4zM15,8h7v2h-7zM15,12h6v2h-6zM3,18c0,1.1 0.9,2 2,2h6c1.1,0 2,-0.9 2,-2L13,8L3,8v10zM14,5h-3l-1,-1L6,4L5,5L2,5v2h12z" />
+</vector>

app/src/main/res/menu/history.xml

@@ -12,7 +12,9 @@
 
     <item
         android:id="@+id/action_clear_history"
+        android:icon="@drawable/ic_delete_sweep_24dp"
         android:title="@string/pref_clear_history"
-        app:showAsAction="never" />
+        app:iconTint="?attr/colorOnPrimary"
+        app:showAsAction="ifRoom" />
 
 </menu>