refactor(DiscoverPostsFragment.java): add getWebUri and getFilterContext methods back

mastodon/src/main/java/org/joinmastodon/android/fragments/discover/DiscoverPostsFragment.java

@@ -1,5 +1,6 @@
 package org.joinmastodon.android.fragments.discover;
 
+import android.net.Uri;
 import android.os.Bundle;
 
 import org.joinmastodon.android.api.requests.trends.GetTrendingStatuses;
@@ -46,4 +47,14 @@ public class DiscoverPostsFragment extends StatusListFragment{
 		adapter.addAdapter(super.getAdapter());
 		return adapter;
 	}
+
+	@Override
+	protected FilterContext getFilterContext() {
+		return FilterContext.PUBLIC;
+	}
+
+	@Override
+	public Uri getWebUri(Uri.Builder base){
+		return isInstanceAkkoma() ? null : base.path("/explore/posts").build();
+	}
 }