Generic fixes (#1716)

* reset brightness after using

* set default qr to auto detect

* minor safety enhancement

* close socket after checking connectivity

* fix incorrect parent exception class

* pump medium and fast priorities even if they are equal to slow

* Add Ton to exchange

* fix silent payments
add Seth bitcoin node

* deselect quantex
add seth node for existing users

* fix node uri

lib/utils/brightness_util.dart

@@ -9,15 +9,12 @@ class BrightnessUtil {
       return;
     }
 
-    // Get the current brightness:
-    final brightness = await DeviceDisplayBrightness.getBrightness();
-
     // ignore: unawaited_futures
     DeviceDisplayBrightness.setBrightness(1.0);
 
     await func();
 
     // ignore: unawaited_futures
-    DeviceDisplayBrightness.setBrightness(brightness);
+    DeviceDisplayBrightness.resetBrightness();
   }
 }