Increase default label size

[bokidori]

PR as per #744

This particular implementation increases default label size by 15%, while existing user set preferences remain unaffected. However, upon testing various default values (1.4, 1.3, 1.25, 1.2, 1.15, 1.1) against different keyboard heights (ranging 27%-35% for portrait mode), I came to the conclusion this might not be the right approach to resolve the issue raised there.

Why? Because the reason I believe we were increasing label size is because we were also reducing the height of the keyboard. With default keyboard height of 35%, label size of 1 is just fine. Only as we reduce the height, label becomes smaller and less intelligible.

However, modification to how the label size scales with regard to keyboard height would require a different approach, with more testing...

[Julow]

Sorry for the slow reply. Thanks :)

I also think that's not the right approach but this improves the current state and is a simple change. 1.15x seems good in my testing as well. Let's merge!