fix theming issue

src/main/java/com/owncloud/android/ui/activity/ToolbarActivity.java

@@ -87,7 +87,7 @@ public abstract class ToolbarActivity extends BaseActivity {
         }
     }
 
-    protected void setupToolbar() {
+    public void setupToolbar() {
         setupToolbar(false);
     }
 

src/main/java/com/owncloud/android/ui/fragment/FileDetailFragment.java

@@ -346,7 +346,7 @@ public class FileDetailFragment extends FileFragment implements OnClickListener
         if(activity != null) {
             activity.setPreviewImageVisibility(View.GONE);
             activity.setProgressBarVisibility(View.VISIBLE);
-            ThemeUtils.setStatusBarColor(activity, ThemeUtils.primaryColor(getContext()));
+            activity.setupToolbar();
         }
 
         super.onStop();