Reset favicon cache

app/src/main/java/eu/faircode/email/ApplicationEx.java

@@ -303,7 +303,8 @@ public class ApplicationEx extends Application {
                     "OnePlus".equalsIgnoreCase(Build.MANUFACTURER) ||
                     "HUAWEI".equalsIgnoreCase(Build.MANUFACTURER))
                 editor.putInt("query_threads", 2);
-        }
+        } else if (version < 1274)
+            ContactInfo.clearCache(context); // Favicon background
 
         if (version < BuildConfig.VERSION_CODE)
             editor.putInt("previous_version", version);