fix(bw): adjust 128x64 layout to accommodate long switch names

[philmoz]

Fixes #4975

Summary of changes:

• Adjust position of switch names to allow more room
• Center justify switch names so it looks more balanced.

[pfeerick]

That looks good as it is, but if it can be right justified, can you tell me if you think that looks better (i.e. so the switch symbols would all line up regardless of if 1/2/3 letters). I tend to think it would look ... neater... but also odd :shrug:

[philmoz]

With right justification the labels have to be pushed far right to allow space for long name. I think this looks cramped.

Center justification:

Edited to compensate for middle position indicator width.