usb_standard_request: Always call configuration_changed_cb

For reasons I don't entirely understand, bulk requests are suddenly
ignored after a SET_CONFIGURATION request (even if the configuration did
not change) unless the endpoints are reinitialized. This is done by
configuration_changed_cb, therefore we call it for every request.

firmware/hackrf_usb/usb_standard_request.c

@@ -100,9 +100,11 @@ bool usb_set_configuration(
 	if( new_configuration != device->configuration ) {
 		// Configuration changed.
 		device->configuration = new_configuration;
-		if (usb_configuration_changed_cb)
-			usb_configuration_changed_cb(device);
 	}
+
+        if (usb_configuration_changed_cb)
+                usb_configuration_changed_cb(device);
+
 	return true;
 }