fix API call

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

@@ -342,7 +342,7 @@ public class UserInfoActivity extends FileActivity {
         public void onStart() {
             super.onStart();
 
-            int color = ThemeUtils.primaryAccentColor(getContext());
+            int color = ThemeUtils.primaryAccentColor(getActivity());
 
             AlertDialog alertDialog = (AlertDialog) getDialog();