Button to manually trigger measurements download

[kuba-orlik]

Is your feature request related to a problem? Please describe.

When I open OpenScale, it doesn't download measurements from the scale, even though I did enable automatic downloading if measurements. I have to click twice on the bluetooth icon to force a reconnect and then the measurements are shown.

Describe the solution you'd like
A button that I can single tap to start downloading the measurements.

Describe alternatives you've considered
Tapping the bluetooth icon twice

Additional context
Using Xiaomi Mi Body Scale 2