ClockWidget: Left-align clock and center based on ideal width

I personally find it very distracting when the clock continuously
shifts around as seconds tick. Because we're not using a monospace
font for the clock, this is to be expected since each number has a
different typographic width.

However, a tradeoff can be made to make this slightly less distracting.
Instead of _perfectly_ centering the time string for every given
possible time, we can center it once based on a constant measurement
and render the rest of the string as left-aligned.

The advantage is that the clock no longer shifts around anymore while
seconds tick. The disadvantage is that the time may sometimes be not
perfectly centered by a pixel or two for certain numbers. Personally,
I find the tradeoff well worth it, and I don't think I would even
notice the imperfect centering unless I was specifically looking for
it and watching it for a long time.

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